Struct LocalDateTime

A date and time in a particular calendar system. A LocalDateTime value does not represent an instant on the global time line, because it has no associated time zone: "November 12th 2009 7pm, ISO calendar" occurred at different instants for different people around the world.
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Implements
Inherited Members
Namespace: NodaTime
Assembly: NodaTime.dll
Syntax
[TypeConverter(typeof(LocalDateTimeTypeConverter))]
public readonly struct LocalDateTime : IEquatable<LocalDateTime>, IComparable<LocalDateTime>, IComparable, IFormattable, IXmlSerializable, IAdditionOperators<LocalDateTime, Period, LocalDateTime>, ISubtractionOperators<LocalDateTime, LocalDateTime, Period>, ISubtractionOperators<LocalDateTime, Period, LocalDateTime>, IComparisonOperators<LocalDateTime, LocalDateTime, bool>, IEqualityOperators<LocalDateTime, LocalDateTime, bool>
Remarks

This type defaults to using the ISO calendar system unless a different calendar system is specified.

Values can freely be compared for equality: a value in a different calendar system is not equal to a value in a different calendar system. However, ordering comparisons (either via the CompareTo(LocalDateTime) method or via operators) fail with ArgumentException; attempting to compare values in different calendars almost always indicates a bug in the calling code.

The default value of this type is 0001-01-01T00:00:00 (midnight on January 1st, 1 C.E.) in the ISO calendar.

Constructors

LocalDateTime(int, int, int, int, int)

Initializes a new instance of the LocalDateTime struct using the ISO calendar system.
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public LocalDateTime(int year, int month, int day, int hour, int minute)
Parameters
Type Name Description
int year The year. This is the "absolute year", so a value of 0 means 1 BC, for example.
int month The month of year.
int day The day of month.
int hour The hour.
int minute The minute.
Sample snippet
using NodaTime;
using NodaTime.Text;
using System;

LocalDateTime dt = new LocalDateTime(2010, 6, 16, 16, 20);
Console.WriteLine(LocalDateTimePattern.GeneralIso.Format(dt));
Console.WriteLine(dt.Calendar);

Output:

2010-06-16T16:20:00
ISO
Exceptions
Type Condition
ArgumentOutOfRangeException The parameters do not form a valid date/time.

LocalDateTime(int, int, int, int, int, CalendarSystem)

Initializes a new instance of the LocalDateTime struct.
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public LocalDateTime(int year, int month, int day, int hour, int minute, CalendarSystem calendar)
Parameters
Type Name Description
int year The year. This is the "absolute year", so, for the ISO calendar, a value of 0 means 1 BC, for example.
int month The month of year.
int day The day of month.
int hour The hour.
int minute The minute.
CalendarSystem calendar The calendar.
Sample snippet
using NodaTime;
using System;

CalendarSystem calendar = CalendarSystem.Iso;
LocalDateTime dt = new LocalDateTime(2010, 6, 16, 16, 20, calendar);
Console.WriteLine(dt.Minute);

Output:

20
Exceptions
Type Condition
ArgumentOutOfRangeException The parameters do not form a valid date/time.

LocalDateTime(int, int, int, int, int, int)

Initializes a new instance of the LocalDateTime struct using the ISO calendar system.
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public LocalDateTime(int year, int month, int day, int hour, int minute, int second)
Parameters
Type Name Description
int year The year. This is the "absolute year", so a value of 0 means 1 BC, for example.
int month The month of year.
int day The day of month.
int hour The hour.
int minute The minute.
int second The second.
Exceptions
Type Condition
ArgumentOutOfRangeException The parameters do not form a valid date/time.

LocalDateTime(int, int, int, int, int, int, CalendarSystem)

Initializes a new instance of the LocalDateTime struct.
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public LocalDateTime(int year, int month, int day, int hour, int minute, int second, CalendarSystem calendar)
Parameters
Type Name Description
int year The year. This is the "absolute year", so, for the ISO calendar, a value of 0 means 1 BC, for example.
int month The month of year.
int day The day of month.
int hour The hour.
int minute The minute.
int second The second.
CalendarSystem calendar The calendar.
Exceptions
Type Condition
ArgumentOutOfRangeException The parameters do not form a valid date/time.

LocalDateTime(int, int, int, int, int, int, int)

Initializes a new instance of the LocalDateTime struct using the ISO calendar system.
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public LocalDateTime(int year, int month, int day, int hour, int minute, int second, int millisecond)
Parameters
Type Name Description
int year The year. This is the "absolute year", so a value of 0 means 1 BC, for example.
int month The month of year.
int day The day of month.
int hour The hour.
int minute The minute.
int second The second.
int millisecond The millisecond.
Exceptions
Type Condition
ArgumentOutOfRangeException The parameters do not form a valid date/time.

LocalDateTime(int, int, int, int, int, int, int, CalendarSystem)

Initializes a new instance of the LocalDateTime struct.
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public LocalDateTime(int year, int month, int day, int hour, int minute, int second, int millisecond, CalendarSystem calendar)
Parameters
Type Name Description
int year The year. This is the "absolute year", so, for the ISO calendar, a value of 0 means 1 BC, for example.
int month The month of year.
int day The day of month.
int hour The hour.
int minute The minute.
int second The second.
int millisecond The millisecond.
CalendarSystem calendar The calendar.
Exceptions
Type Condition
ArgumentOutOfRangeException The parameters do not form a valid date/time.

Properties

Calendar

Gets the calendar system associated with this local date and time.
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public CalendarSystem Calendar { get; }
Property Value
Type Description
CalendarSystem The calendar system associated with this local date and time.

ClockHourOfHalfDay

Gets the hour of the half-day of this local date and time, in the range 1 to 12 inclusive.
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public int ClockHourOfHalfDay { get; }
Property Value
Type Description
int The hour of the half-day of this local date and time, in the range 1 to 12 inclusive.

Date

Gets the date portion of this local date and time as a LocalDate in the same calendar system as this value.
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public LocalDate Date { get; }
Property Value
Type Description
LocalDate The date portion of this local date and time as a LocalDate in the same calendar system as this value.

Day

Gets the day of this local date and time within the month.
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public int Day { get; }
Property Value
Type Description
int The day of this local date and time within the month.

DayOfWeek

Gets the week day of this local date and time expressed as an IsoDayOfWeek value.
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public IsoDayOfWeek DayOfWeek { get; }
Property Value
Type Description
IsoDayOfWeek The week day of this local date and time expressed as an IsoDayOfWeek.

DayOfYear

Gets the day of this local date and time within the year.
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public int DayOfYear { get; }
Property Value
Type Description
int The day of this local date and time within the year.

Era

Gets the era of this local date and time.
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public Era Era { get; }
Property Value
Type Description
Era The era of this local date and time.

Hour

Gets the hour of day of this local date and time, in the range 0 to 23 inclusive.
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public int Hour { get; }
Property Value
Type Description
int The hour of day of this local date and time, in the range 0 to 23 inclusive.

MaxIsoValue

The maximum (latest) date and time representable in the ISO calendar system. This is a nanosecond before midnight at the end of MaxIsoValue.
Since 3.1.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public static LocalDateTime MaxIsoValue { get; }
Property Value
Type Description
LocalDateTime

Millisecond

Gets the millisecond of this local date and time within the second, in the range 0 to 999 inclusive.
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public int Millisecond { get; }
Property Value
Type Description
int The millisecond of this local date and time within the second, in the range 0 to 999 inclusive.

MinIsoValue

The minimum (earliest) date and time representable in the ISO calendar system. This is midnight at the start of MinIsoValue.
Since 3.1.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public static LocalDateTime MinIsoValue { get; }
Property Value
Type Description
LocalDateTime

Minute

Gets the minute of this local date and time, in the range 0 to 59 inclusive.
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public int Minute { get; }
Property Value
Type Description
int The minute of this local date and time, in the range 0 to 59 inclusive.

Month

Gets the month of this local date and time within the year.
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public int Month { get; }
Property Value
Type Description
int The month of this local date and time within the year.

NanosecondOfDay

Gets the nanosecond of this local date and time within the day, in the range 0 to 86,399,999,999,999 inclusive.
Since 2.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public long NanosecondOfDay { get; }
Property Value
Type Description
long The nanosecond of this local date and time within the day, in the range 0 to 86,399,999,999,999 inclusive.

NanosecondOfSecond

Gets the nanosecond of this local time within the second, in the range 0 to 999,999,999 inclusive.
Since 2.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public int NanosecondOfSecond { get; }
Property Value
Type Description
int The nanosecond of this local time within the second, in the range 0 to 999,999,999 inclusive.

Second

Gets the second of this local date and time within the minute, in the range 0 to 59 inclusive.
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public int Second { get; }
Property Value
Type Description
int The second of this local date and time within the minute, in the range 0 to 59 inclusive.

TickOfDay

Gets the tick of this local date and time within the day, in the range 0 to 863,999,999,999 inclusive.
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public long TickOfDay { get; }
Property Value
Type Description
long The tick of this local date and time within the day, in the range 0 to 863,999,999,999 inclusive.

TickOfSecond

Gets the tick of this local time within the second, in the range 0 to 9,999,999 inclusive.
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public int TickOfSecond { get; }
Property Value
Type Description
int The tick of this local time within the second, in the range 0 to 9,999,999 inclusive.

TimeOfDay

Gets the time portion of this local date and time as a LocalTime.
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public LocalTime TimeOfDay { get; }
Property Value
Type Description
LocalTime The time portion of this local date and time as a LocalTime.

Year

Gets the year of this local date and time.
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public int Year { get; }
Property Value
Type Description
int The year of this local date and time.
Remarks
This returns the "absolute year", so, for the ISO calendar, a value of 0 means 1 BC, for example.

YearOfEra

Gets the year of this local date and time within its era.
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public int YearOfEra { get; }
Property Value
Type Description
int The year of this local date and time within its era.

Methods

Add(LocalDateTime, Period)

Add the specified period to the date and time. Fields are added in descending order of significance (years first, then months, and so on). Friendly alternative to operator+().
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public static LocalDateTime Add(LocalDateTime localDateTime, Period period)
Parameters
Type Name Description
LocalDateTime localDateTime Initial local date and time
Period period Period to add
Returns
Type Description
LocalDateTime The resulting local date and time

AddSchema(XmlSchemaSet)

Adds the XML schema type describing the structure of the LocalDateTime XML serialization to the given xmlSchemaSet. the xmlSchemaSet.
Since 3.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public static XmlQualifiedName AddSchema(XmlSchemaSet xmlSchemaSet)
Parameters
Type Name Description
XmlSchemaSet xmlSchemaSet The XML schema set provided by XmlSchemaExporter.
Returns
Type Description
XmlQualifiedName The qualified name of the schema type that was added to the xmlSchemaSet.

CompareTo(LocalDateTime)

Indicates whether this date/time is earlier, later or the same as another one. See the type documentation for a description of ordering semantics.
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public int CompareTo(LocalDateTime other)
Parameters
Type Name Description
LocalDateTime other The other local date/time to compare with this value.
Returns
Type Description
int A value less than zero if this date/time is earlier than other; zero if this date/time is the same as other; a value greater than zero if this date/time is later than other.
Exceptions
Type Condition
ArgumentException The calendar system of other is not the same as the calendar system of this value.

Deconstruct(out LocalDate, out LocalTime)

Deconstruct this LocalDateTime into its components.
Since 2.3.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public void Deconstruct(out LocalDate date, out LocalTime time)
Parameters
Type Name Description
LocalDate date The date portion of the value.
LocalTime time The time portion of the value.

Equals(LocalDateTime)

Indicates whether the current object is equal to another object of the same type. See the type documentation for a description of equality semantics.
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public bool Equals(LocalDateTime other)
Parameters
Type Name Description
LocalDateTime other An object to compare with this object.
Returns
Type Description
bool true if the current object is equal to the other parameter; otherwise, false.

Equals(object?)

Determines whether the specified object is equal to this instance. See the type documentation for a description of equality semantics.
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public override bool Equals(object? obj)
Parameters
Type Name Description
object obj The object to compare with this instance.
Returns
Type Description
bool true if the specified object is equal to this instance; otherwise, false.
Overrides

FromDateTime(DateTime)

Converts a DateTime of any kind to a LocalDateTime in the ISO calendar. This does not perform any time zone conversions, so a DateTime with a Kind of Utc will still have the same day/hour/minute etc - it won't be converted into the local system time.
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public static LocalDateTime FromDateTime(DateTime dateTime)
Parameters
Type Name Description
DateTime dateTime Value to convert into a Noda Time local date and time
Returns
Type Description
LocalDateTime A new LocalDateTime with the same values as the specified DateTime.

FromDateTime(DateTime, CalendarSystem)

Converts a DateTime of any kind to a LocalDateTime in the specified calendar. This does not perform any time zone conversions, so a DateTime with a Kind of Utc will still have the same day/hour/minute etc - it won't be converted into the local system time.
Since 2.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public static LocalDateTime FromDateTime(DateTime dateTime, CalendarSystem calendar)
Parameters
Type Name Description
DateTime dateTime Value to convert into a Noda Time local date and time
CalendarSystem calendar The calendar system to convert into
Returns
Type Description
LocalDateTime A new LocalDateTime with the same values as the specified DateTime.

GetHashCode()

Returns a hash code for this instance. See the type documentation for a description of equality semantics.
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public override int GetHashCode()
Returns
Type Description
int A hash code for this instance, suitable for use in hashing algorithms and data structures like a hash table.
Overrides

InUtc()

Returns the mapping of this local date/time within Utc.
Since 1.1.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public ZonedDateTime InUtc()
Returns
Type Description
ZonedDateTime The result of mapping this local date/time in UTC.
Remarks
As UTC is a fixed time zone, there is no chance that this local date/time is ambiguous or skipped.

InZone(DateTimeZone, ZoneLocalMappingResolver)

Resolves this local date and time into a ZonedDateTime in the given time zone, following the given ZoneLocalMappingResolver to handle ambiguity and skipped times.
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public ZonedDateTime InZone(DateTimeZone zone, ZoneLocalMappingResolver resolver)
Parameters
Type Name Description
DateTimeZone zone The time zone to map this local date and time into
ZoneLocalMappingResolver resolver The resolver to apply to the mapping.
Returns
Type Description
ZonedDateTime The result of resolving the mapping.
Remarks
See InZoneStrictly(DateTimeZone) and InZoneLeniently(DateTimeZone) for alternative ways to map a local time to a specific instant. This is a convenience method for calling ResolveLocal(LocalDateTime, ZoneLocalMappingResolver).

InZoneLeniently(DateTimeZone)

Returns the mapping of this local date/time within the given DateTimeZone, with "lenient" rules applied such that ambiguous values map to the earlier of the alternatives, and "skipped" values are shifted forward by the duration of the "gap".
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public ZonedDateTime InZoneLeniently(DateTimeZone zone)
Parameters
Type Name Description
DateTimeZone zone The time zone in which to map this local date/time.
Returns
Type Description
ZonedDateTime The result of mapping this local date/time in the given time zone.
Remarks
See InZoneStrictly(DateTimeZone) and InZone(DateTimeZone, ZoneLocalMappingResolver) for alternative ways to map a local time to a specific instant. This is solely a convenience method for calling AtLeniently(LocalDateTime).

Note: The behavior of this method was changed in version 2.0 to fit the most commonly seen real-world usage pattern. Previous versions returned the later instance of ambiguous values, and returned the start of the zone interval after the gap for skipped value. The previous functionality can still be used if desired, by using InZone(DateTimeZone, ZoneLocalMappingResolver) and passing a resolver that combines the ReturnLater and ReturnStartOfIntervalAfter resolvers.

InZoneStrictly(DateTimeZone)

Returns the mapping of this local date/time within the given DateTimeZone, with "strict" rules applied such that an exception is thrown if either the mapping is ambiguous or the time is skipped.
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public ZonedDateTime InZoneStrictly(DateTimeZone zone)
Parameters
Type Name Description
DateTimeZone zone The time zone in which to map this local date/time.
Returns
Type Description
ZonedDateTime The result of mapping this local date/time in the given time zone.
Remarks
See InZoneLeniently(DateTimeZone) and InZone(DateTimeZone, ZoneLocalMappingResolver) for alternative ways to map a local time to a specific instant. This is solely a convenience method for calling AtStrictly(LocalDateTime).
Exceptions
Type Condition
SkippedTimeException This local date/time is skipped in the given time zone.
AmbiguousTimeException This local date/time is ambiguous in the given time zone.

Max(LocalDateTime, LocalDateTime)

Returns the later date/time of the given two.
Since 2.3.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public static LocalDateTime Max(LocalDateTime x, LocalDateTime y)
Parameters
Type Name Description
LocalDateTime x The first date/time to compare.
LocalDateTime y The second date/time to compare.
Returns
Type Description
LocalDateTime The later date/time of x or y.
Exceptions
Type Condition
ArgumentException The two date/times have different calendar systems.

Min(LocalDateTime, LocalDateTime)

Returns the earlier date/time of the given two.
Since 2.3.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public static LocalDateTime Min(LocalDateTime x, LocalDateTime y)
Parameters
Type Name Description
LocalDateTime x The first date/time to compare.
LocalDateTime y The second date/time to compare.
Returns
Type Description
LocalDateTime The earlier date/time of x or y.
Exceptions
Type Condition
ArgumentException The two date/times have different calendar systems.

Minus(LocalDateTime)

Subtracts the specified date/time from this date/time, returning the result as a Period. Fluent alternative to operator-().
Since 2.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public Period Minus(LocalDateTime localDateTime)
Parameters
Type Name Description
LocalDateTime localDateTime The date/time to subtract from this
Returns
Type Description
Period The difference between the specified date/time and this one
Remarks
The specified date/time must be in the same calendar system as this.

Minus(Period)

Subtracts a period from a local date/time. Fields are subtracted in descending order of significance (years first, then months, and so on).
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public LocalDateTime Minus(Period period)
Parameters
Type Name Description
Period period Period to subtract
Returns
Type Description
LocalDateTime The resulting local date and time

Next(IsoDayOfWeek)

Returns the next LocalDateTime falling on the specified IsoDayOfWeek, at the same time of day as this value. This is a strict "next" - if this value on already falls on the target day of the week, the returned value will be a week later.
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public LocalDateTime Next(IsoDayOfWeek targetDayOfWeek)
Parameters
Type Name Description
IsoDayOfWeek targetDayOfWeek The ISO day of the week to return the next date of.
Returns
Type Description
LocalDateTime The next LocalDateTime falling on the specified day of the week.
Exceptions
Type Condition
InvalidOperationException The underlying calendar doesn't use ISO days of the week.
ArgumentOutOfRangeException targetDayOfWeek is not a valid day of the week (Monday to Sunday).

Plus(Period)

Adds a period to this local date/time. Fields are added in descending order of significance (years first, then months, and so on).
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public LocalDateTime Plus(Period period)
Parameters
Type Name Description
Period period Period to add
Returns
Type Description
LocalDateTime The resulting local date and time

PlusDays(int)

Returns a new LocalDateTime representing the current value with the given number of days added.
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public LocalDateTime PlusDays(int days)
Parameters
Type Name Description
int days The number of days to add
Returns
Type Description
LocalDateTime The current value plus the given number of days.
Remarks

This method does not try to maintain the month or year of the current value, so adding 3 days to a value on January 30th will result in a value on February 2nd.

PlusHours(long)

Returns a new LocalDateTime representing the current value with the given number of hours added.
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public LocalDateTime PlusHours(long hours)
Parameters
Type Name Description
long hours The number of hours to add
Returns
Type Description
LocalDateTime The current value plus the given number of hours.

PlusMilliseconds(long)

Returns a new LocalDateTime representing the current value with the given number of milliseconds added.
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public LocalDateTime PlusMilliseconds(long milliseconds)
Parameters
Type Name Description
long milliseconds The number of milliseconds to add
Returns
Type Description
LocalDateTime The current value plus the given number of milliseconds.

PlusMinutes(long)

Returns a new LocalDateTime representing the current value with the given number of minutes added.
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public LocalDateTime PlusMinutes(long minutes)
Parameters
Type Name Description
long minutes The number of minutes to add
Returns
Type Description
LocalDateTime The current value plus the given number of minutes.

PlusMonths(int)

Returns a new LocalDateTime representing the current value with the given number of months added.
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public LocalDateTime PlusMonths(int months)
Parameters
Type Name Description
int months The number of months to add
Returns
Type Description
LocalDateTime The current value plus the given number of months.
Remarks

This method does not try to maintain the year of the current value, so adding four months to a value in October will result in a value in the following February.

If the resulting date is invalid, the day of month is reduced to find a valid value. For example, adding one month to January 30th 2011 will return February 28th 2011; subtracting one month from March 30th 2011 will return February 28th 2011.

PlusNanoseconds(long)

Returns a new LocalDateTime representing the current value with the given number of nanoseconds added.
Since 2.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public LocalDateTime PlusNanoseconds(long nanoseconds)
Parameters
Type Name Description
long nanoseconds The number of nanoseconds to add
Returns
Type Description
LocalDateTime The current value plus the given number of nanoseconds.

PlusSeconds(long)

Returns a new LocalDateTime representing the current value with the given number of seconds added.
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public LocalDateTime PlusSeconds(long seconds)
Parameters
Type Name Description
long seconds The number of seconds to add
Returns
Type Description
LocalDateTime The current value plus the given number of seconds.

PlusTicks(long)

Returns a new LocalDateTime representing the current value with the given number of ticks added.
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public LocalDateTime PlusTicks(long ticks)
Parameters
Type Name Description
long ticks The number of ticks to add
Returns
Type Description
LocalDateTime The current value plus the given number of ticks.

PlusWeeks(int)

Returns a new LocalDateTime representing the current value with the given number of weeks added.
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public LocalDateTime PlusWeeks(int weeks)
Parameters
Type Name Description
int weeks The number of weeks to add
Returns
Type Description
LocalDateTime The current value plus the given number of weeks.

PlusYears(int)

Returns a new LocalDateTime representing the current value with the given number of years added.
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public LocalDateTime PlusYears(int years)
Parameters
Type Name Description
int years The number of years to add
Returns
Type Description
LocalDateTime The current value plus the given number of years.
Remarks
If the resulting date is invalid, lower fields (typically the day of month) are reduced to find a valid value. For example, adding one year to February 29th 2012 will return February 28th 2013; subtracting one year from February 29th 2012 will return February 28th 2011.

Previous(IsoDayOfWeek)

Returns the previous LocalDateTime falling on the specified IsoDayOfWeek, at the same time of day as this value. This is a strict "previous" - if this value on already falls on the target day of the week, the returned value will be a week earlier.
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public LocalDateTime Previous(IsoDayOfWeek targetDayOfWeek)
Parameters
Type Name Description
IsoDayOfWeek targetDayOfWeek The ISO day of the week to return the previous date of.
Returns
Type Description
LocalDateTime The previous LocalDateTime falling on the specified day of the week.
Exceptions
Type Condition
InvalidOperationException The underlying calendar doesn't use ISO days of the week.
ArgumentOutOfRangeException targetDayOfWeek is not a valid day of the week (Monday to Sunday).

Subtract(LocalDateTime, LocalDateTime)

Subtracts one date/time from another, returning the result as a Period.
Since 2.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public static Period Subtract(LocalDateTime lhs, LocalDateTime rhs)
Parameters
Type Name Description
LocalDateTime lhs The date/time to subtract from
LocalDateTime rhs The date/time to subtract
Returns
Type Description
Period The result of subtracting one date/time from another.
Remarks
This is simply a convenience method for calling Between(LocalDateTime, LocalDateTime). The calendar systems of the two date/times must be the same.

Subtract(LocalDateTime, Period)

Subtracts the specified period from the date and time. Friendly alternative to operator-().
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public static LocalDateTime Subtract(LocalDateTime localDateTime, Period period)
Parameters
Type Name Description
LocalDateTime localDateTime Initial local date and time
Period period Period to subtract
Returns
Type Description
LocalDateTime The resulting local date and time

ToDateTimeUnspecified()

Constructs a DateTime from this value which has a Kind of Unspecified.
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public DateTime ToDateTimeUnspecified()
Returns
Type Description
DateTime A DateTime value for the same date and time as this value.
Remarks

Unspecified is slightly odd - it can be treated as UTC if you use ToLocalTime() or as system local time if you use ToUniversalTime(), but it's the only kind which allows you to construct a DateTimeOffset with an arbitrary offset, which makes it as close to the Noda Time non-system-specific "local" concept as exists in .NET.

If the date and time is not on a tick boundary (the unit of granularity of DateTime) the value will be truncated towards the start of time.

DateTime uses the Gregorian calendar by definition, so the value is implicitly converted to the Gregorian calendar first. The result will be on the same physical day, but the values returned by the Year/Month/Day properties of the DateTime may not match the Year/Month/Day properties of this value.

Exceptions
Type Condition
InvalidOperationException The date/time is outside the range of DateTime.

ToString()

Returns a string that represents this instance.
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public override string ToString()
Returns
Type Description
string The value of the current instance in the default format pattern ("G"), using the current thread's culture to obtain a format provider.
Overrides

ToString(string?, IFormatProvider?)

Formats the value of the current instance using the specified pattern.
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public string ToString(string? patternText, IFormatProvider? formatProvider)
Parameters
Type Name Description
string patternText The string specifying the pattern to use, or null to use the default format pattern ("G").
IFormatProvider formatProvider The IFormatProvider to use when formatting the value, or null to use the current thread's culture to obtain a format provider.
Returns
Type Description
string A string containing the value of the current instance in the specified format.
Sample snippet
using NodaTime;
using System;
using System.Globalization;

LocalDateTime dt = new LocalDateTime(2010, 6, 16, 16, 20);
Console.WriteLine(dt.ToString("uuuu-MM-dd'T'HH:mm:ss", CultureInfo.InvariantCulture));

Output:

2010-06-16T16:20:00

With(Func<LocalDate, LocalDate>)

Returns this date/time, with the given date adjuster applied to it, maintaining the existing time of day.
Since 2.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public LocalDateTime With(Func<LocalDate, LocalDate> adjuster)
Parameters
Type Name Description
Func<LocalDate, LocalDate> adjuster The adjuster to apply.
Returns
Type Description
LocalDateTime The adjusted date/time.
Remarks
If the adjuster attempts to construct an invalid date (such as by trying to set a day-of-month of 30 in February), any exception thrown by that construction attempt will be propagated through this method.

With(Func<LocalTime, LocalTime>)

Returns this date/time, with the given time adjuster applied to it, maintaining the existing date.
Since 2.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public LocalDateTime With(Func<LocalTime, LocalTime> adjuster)
Parameters
Type Name Description
Func<LocalTime, LocalTime> adjuster The adjuster to apply.
Returns
Type Description
LocalDateTime The adjusted date/time.
Remarks
If the adjuster attempts to construct an invalid time, any exception thrown by that construction attempt will be propagated through this method.

WithCalendar(CalendarSystem)

Creates a new LocalDateTime representing the same physical date and time, but in a different calendar. The returned LocalDateTime is likely to have different date field values to this one. For example, January 1st 1970 in the Gregorian calendar was December 19th 1969 in the Julian calendar.
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public LocalDateTime WithCalendar(CalendarSystem calendar)
Parameters
Type Name Description
CalendarSystem calendar The calendar system to convert this local date to.
Returns
Type Description
LocalDateTime The converted LocalDateTime.

WithOffset(Offset)

Returns an OffsetDateTime for this local date/time with the given offset.
Since 1.1.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public OffsetDateTime WithOffset(Offset offset)
Parameters
Type Name Description
Offset offset The offset to apply.
Returns
Type Description
OffsetDateTime The result of this local date/time offset by the given amount.
Remarks
This method is purely a convenient alternative to calling the OffsetDateTime constructor directly.

Operators

operator +(LocalDateTime, Period)

Adds a period to a local date/time. Fields are added in descending order of significance (years first, then months, and so on). This is a convenience operator over the Plus(Period) method.
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public static LocalDateTime operator +(LocalDateTime localDateTime, Period period)
Parameters
Type Name Description
LocalDateTime localDateTime Initial local date and time
Period period Period to add
Returns
Type Description
LocalDateTime The resulting local date and time

operator ==(LocalDateTime, LocalDateTime)

Implements the operator == (equality). See the type documentation for a description of equality semantics.
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public static bool operator ==(LocalDateTime left, LocalDateTime right)
Parameters
Type Name Description
LocalDateTime left The left hand side of the operator.
LocalDateTime right The right hand side of the operator.
Returns
Type Description
bool true if values are equal to each other, otherwise false.

operator >(LocalDateTime, LocalDateTime)

Compares two LocalDateTime values to see if the left one is strictly later than the right one. See the type documentation for a description of ordering semantics.
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public static bool operator >(LocalDateTime lhs, LocalDateTime rhs)
Parameters
Type Name Description
LocalDateTime lhs First operand of the comparison
LocalDateTime rhs Second operand of the comparison
Returns
Type Description
bool true if the lhs is strictly later than rhs, false otherwise.
Exceptions
Type Condition
ArgumentException The calendar system of rhs is not the same as the calendar of lhs.

operator >=(LocalDateTime, LocalDateTime)

Compares two LocalDateTime values to see if the left one is later than or equal to the right one. See the type documentation for a description of ordering semantics.
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public static bool operator >=(LocalDateTime lhs, LocalDateTime rhs)
Parameters
Type Name Description
LocalDateTime lhs First operand of the comparison
LocalDateTime rhs Second operand of the comparison
Returns
Type Description
bool true if the lhs is later than or equal to rhs, false otherwise.
Exceptions
Type Condition
ArgumentException The calendar system of rhs is not the same as the calendar of lhs.

operator !=(LocalDateTime, LocalDateTime)

Implements the operator != (inequality). See the type documentation for a description of equality semantics.
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public static bool operator !=(LocalDateTime left, LocalDateTime right)
Parameters
Type Name Description
LocalDateTime left The left hand side of the operator.
LocalDateTime right The right hand side of the operator.
Returns
Type Description
bool true if values are not equal to each other, otherwise false.

operator <(LocalDateTime, LocalDateTime)

Compares two LocalDateTime values to see if the left one is strictly earlier than the right one. See the type documentation for a description of ordering semantics.
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public static bool operator <(LocalDateTime lhs, LocalDateTime rhs)
Parameters
Type Name Description
LocalDateTime lhs First operand of the comparison
LocalDateTime rhs Second operand of the comparison
Returns
Type Description
bool true if the lhs is strictly earlier than rhs, false otherwise.
Exceptions
Type Condition
ArgumentException The calendar system of rhs is not the same as the calendar of lhs.

operator <=(LocalDateTime, LocalDateTime)

Compares two LocalDateTime values to see if the left one is earlier than or equal to the right one. See the type documentation for a description of ordering semantics.
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public static bool operator <=(LocalDateTime lhs, LocalDateTime rhs)
Parameters
Type Name Description
LocalDateTime lhs First operand of the comparison
LocalDateTime rhs Second operand of the comparison
Returns
Type Description
bool true if the lhs is earlier than or equal to rhs, false otherwise.
Exceptions
Type Condition
ArgumentException The calendar system of rhs is not the same as the calendar of lhs.

operator -(LocalDateTime, LocalDateTime)

Subtracts one date/time from another, returning the result as a Period.
Since 2.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public static Period operator -(LocalDateTime lhs, LocalDateTime rhs)
Parameters
Type Name Description
LocalDateTime lhs The date/time to subtract from
LocalDateTime rhs The date/time to subtract
Returns
Type Description
Period The result of subtracting one date/time from another.
Remarks
This is simply a convenience operator for calling Between(LocalDateTime, LocalDateTime). The calendar systems of the two date/times must be the same.

operator -(LocalDateTime, Period)

Subtracts a period from a local date/time. Fields are subtracted in descending order of significance (years first, then months, and so on). This is a convenience operator over the Minus(Period) method.
Since 1.0.x
Availability net6.0, net8.0, netstandard2.0
Declaration
public static LocalDateTime operator -(LocalDateTime localDateTime, Period period)
Parameters
Type Name Description
LocalDateTime localDateTime Initial local date and time
Period period Period to subtract
Returns
Type Description
LocalDateTime The resulting local date and time

Explicit Interface Implementations

IComparable.CompareTo(object?)

Implementation of CompareTo(object) to compare two LocalDateTimes. See the type documentation for a description of ordering semantics.
Since 1.1.x
Availability net6.0, net8.0, netstandard2.0
Declaration
int IComparable.CompareTo(object? obj)
Parameters
Type Name Description
object obj The object to compare this value with.
Returns
Type Description
int The result of comparing this LocalDateTime with another one; see CompareTo(LocalDateTime) for general details. If obj is null, this method returns a value greater than 0.
Remarks
This uses explicit interface implementation to avoid it being called accidentally. The generic implementation should usually be preferred.
Exceptions
Type Condition
ArgumentException obj is non-null but does not refer to an instance of LocalDateTime, or refers to a date/time in a different calendar system.

IXmlSerializable.GetSchema()

This method is reserved and should not be used. When implementing the IXmlSerializable interface, you should return null (Nothing in Visual Basic) from this method, and instead, if specifying a custom schema is required, apply the XmlSchemaProviderAttribute to the class.
Since 3.2.x
Availability net6.0, net8.0, netstandard2.0
Declaration
XmlSchema IXmlSerializable.GetSchema()
Returns
Type Description
XmlSchema An XmlSchema that describes the XML representation of the object that is produced by the WriteXml(XmlWriter) method and consumed by the ReadXml(XmlReader) method.

IXmlSerializable.ReadXml(XmlReader)

Generates an object from its XML representation.
Since 1.2.x
Availability net6.0, net8.0, netstandard2.0
Declaration
void IXmlSerializable.ReadXml(XmlReader reader)
Parameters
Type Name Description
XmlReader reader The XmlReader stream from which the object is deserialized.

IXmlSerializable.WriteXml(XmlWriter)

Converts an object into its XML representation.
Since 1.2.x
Availability net6.0, net8.0, netstandard2.0
Declaration
void IXmlSerializable.WriteXml(XmlWriter writer)
Parameters
Type Name Description
XmlWriter writer The XmlWriter stream to which the object is serialized.

Implements