Class DateInterval

An interval between two dates.

Since 2.0.x

Availability netstandard2.0

Inheritance

Object

DateInterval

Implements

IEquatable<DateInterval>

IEnumerable<LocalDate>

IEnumerable

Inherited Members

Object.Equals(Object, Object)

Object.GetType()

Object.MemberwiseClone()

Object.ReferenceEquals(Object, Object)

Namespace: NodaTime

Assembly: NodaTime.dll

Syntax

public sealed class DateInterval : IEquatable<DateInterval>, IEnumerable<LocalDate>, IEnumerable

Remarks

Equality is defined in a component-wise fashion: two date intervals are considered equal if their start dates are equal to each other and their end dates are equal to each other. Ordering between date intervals is not defined.

The two dates must be in the same calendar, and the end date must not be earlier than the start date.

The end date is deemed to be part of the range, as this matches many real life uses of date ranges. For example, if someone says "I'm going to be on holiday from Monday to Friday," they usually mean that Friday is part of their holiday.

Constructors

DateInterval(LocalDate, LocalDate)

Constructs a date interval from a start date and an end date, both of which are included in the interval.

Since 2.0.x

Availability netstandard2.0

Declaration

public DateInterval(LocalDate start, LocalDate end)

Parameters

Type	Name	Description
LocalDate	start	Start date of the interval
LocalDate	end	End date of the interval

Sample snippet

using NodaTime;
using System;

var calendar = CalendarSystem.Gregorian;
LocalDate start = new LocalDate(2017, 1, 1, calendar);
LocalDate end = new LocalDate(2017, 12, 31, calendar);

DateInterval interval = new DateInterval(start, end);

Console.WriteLine(interval.Length);
Console.WriteLine(interval.ToString());
Console.WriteLine(interval.Start);
Console.WriteLine(interval.End);
Console.WriteLine(interval.Calendar);

Output:

365
[2017-01-01, 2017-12-31]
Sunday, 01 January 2017
Sunday, 31 December 2017
Gregorian

Exceptions

Type	Condition
ArgumentException	end is earlier than start or the two dates are in different calendars.

Properties

Calendar

Gets the calendar system of the dates in this interval.

Since 2.3.x

Availability netstandard2.0

Declaration

public CalendarSystem Calendar { get; }

Property Value

Type	Description
CalendarSystem	The calendar system of the dates in this interval.

End

Gets the end date of the interval.

Since 2.0.x

Availability netstandard2.0

Declaration

public LocalDate End { get; }

Property Value

Type	Description
LocalDate	The end date of the interval.

Length

Gets the length of this date interval in days. This will always be at least 1.

Since 2.0.x

Availability netstandard2.0

Declaration

public int Length { get; }

Property Value

Type	Description
Int32	The length of this date interval in days.

Start

Gets the start date of the interval.

Since 2.0.x

Availability netstandard2.0

Declaration

public LocalDate Start { get; }

Property Value

Type	Description
LocalDate	The start date of the interval.

Methods

Contains(DateInterval)

Checks whether the given interval is within this interval. This requires that the start date of the specified interval is not earlier than the start date of this interval, and the end date of the specified interval is not later than the end date of this interval.

Since 2.3.x

Availability netstandard2.0

Declaration

public bool Contains(DateInterval interval)

Parameters

Type	Name	Description
DateInterval	interval	The interval to check for containment within this interval.

Returns

Type	Description
Boolean	true if interval is within this interval; false otherwise.

Remarks

An interval contains another interval with same start and end dates, or itself.

Sample snippet

using NodaTime;
using System;

LocalDate start = new LocalDate(2017, 1, 1);
LocalDate end = new LocalDate(2017, 12, 31);

DateInterval interval = new DateInterval(start, end);
DateInterval june = new DateInterval(
    new LocalDate(2017, 6, 1),
    new LocalDate(2017, 6, 30));

var result = interval.Contains(june);
Console.WriteLine(result);

Output:

True

Exceptions

Type	Condition
ArgumentException	interval uses a different calendar to this date interval.

Contains(LocalDate)

Checks whether the given date is within this date interval. This requires that the date is not earlier than the start date, and not later than the end date.

Since 2.0.x

Availability netstandard2.0

Declaration

public bool Contains(LocalDate date)

Parameters

Type	Name	Description
LocalDate	date	The date to check for containment within this interval.

Returns

Type	Description
Boolean	true if date is within this interval; false otherwise.

Sample snippet

using NodaTime;
using System;

LocalDate start = new LocalDate(2017, 1, 1);
LocalDate end = new LocalDate(2017, 12, 31);

DateInterval interval = new DateInterval(start, end);

var result = interval.Contains(new LocalDate(2017, 12, 5));
Console.WriteLine(result);

Output:

True

Exceptions

Type	Condition
ArgumentException	date is not in the same calendar as the start and end date of this interval.

Deconstruct(out LocalDate, out LocalDate)

Deconstruct this date interval into its components.

Since 2.3.x

Availability netstandard2.0

Declaration

public void Deconstruct(out LocalDate start, out LocalDate end)

Parameters

Type	Name	Description
LocalDate	start	The LocalDate representing the start of the interval.
LocalDate	end	The LocalDate representing the end of the interval.

Sample snippet

using NodaTime;
using System;

LocalDate start = new LocalDate(2017, 1, 1);
LocalDate end = new LocalDate(2017, 12, 31);

DateInterval value = new DateInterval(start, end);
value.Deconstruct(out LocalDate actualStart, out LocalDate actualEnd);

Console.WriteLine(actualStart);
Console.WriteLine(actualEnd);

Output:

Sunday, 01 January 2017
Sunday, 31 December 2017

Equals(DateInterval)

Compares the given date interval for equality with this one. See the type documentation for a description of equality semantics.

Since 2.0.x

Availability netstandard2.0

Declaration

public bool Equals(DateInterval other)

Parameters

Type	Name	Description
DateInterval	other	The date interval to compare this one with.

Returns

Type	Description
Boolean	True if this date interval has the same same start and end date as the one specified.

Equals(Object)

Compares the given object for equality with this one, as per Equals(DateInterval). See the type documentation for a description of equality semantics.

Since 2.0.x

Availability netstandard2.0

Declaration

public override bool Equals(object obj)

Parameters

Type	Name	Description
Object	obj	The value to compare this one with.

Returns

Type	Description
Boolean	true if the other object is a date interval equal to this one, consistent with Equals(DateInterval).

Overrides

System.Object.Equals(System.Object)

GetEnumerator()

Returns an enumerator for the dates in the interval, including both Start and End.

Since 2.3.x

Availability netstandard2.0

Declaration

public IEnumerator<LocalDate> GetEnumerator()

Returns

Type	Description
IEnumerator<LocalDate>	An enumerator for the interval.

GetHashCode()

Returns the hash code for this interval, consistent with Equals(DateInterval). See the type documentation for a description of equality semantics.

Since 2.0.x

Availability netstandard2.0

Declaration

public override int GetHashCode()

Returns

Type	Description
Int32	The hash code for this interval.

Overrides

System.Object.GetHashCode()

Intersection(DateInterval)

Returns the intersection between the given interval and this interval.

Since 2.3.x

Availability netstandard2.0

Declaration

public DateInterval Intersection(DateInterval interval)

Parameters

Type	Name	Description
DateInterval	interval	The specified interval to intersect with this one.

Returns

Type	Description
DateInterval	A DateInterval corresponding to the intersection between the given interval and the current instance. If there is no intersection, a null reference is returned.

Sample snippet

using NodaTime;
using System;

DateInterval januaryToAugust = new DateInterval(
    new LocalDate(2017, 1, 1),
    new LocalDate(2017, 8, 31));

DateInterval juneToNovember = new DateInterval(
    new LocalDate(2017, 6, 1),
    new LocalDate(2017, 11, 30));

DateInterval juneToAugust = new DateInterval(
    new LocalDate(2017, 6, 1),
    new LocalDate(2017, 8, 31));

var result = januaryToAugust.Intersection(juneToNovember);
Console.WriteLine(result);

Output:

[2017-06-01, 2017-08-31]

Exceptions

Type	Condition
ArgumentException	interval uses a different calendar to this date interval.

ToString()

Returns a string representation of this interval.

Since 2.0.x

Availability netstandard2.0

Declaration

public override string ToString()

Returns

Type	Description
String	A string representation of this interval, as [start, end], where "start" and "end" are the dates formatted using an ISO-8601 compatible pattern.

Overrides

System.Object.ToString()

Union(DateInterval)

Returns the union between the given interval and this interval, as long as they're overlapping or contiguous.

Since 2.3.x

Availability netstandard2.0

Declaration

public DateInterval Union(DateInterval interval)

Parameters

Type	Name	Description
DateInterval	interval	The specified interval from which to generate the union interval.

Returns

Type	Description
DateInterval	A DateInterval corresponding to the union between the given interval and the current instance, in the case the intervals overlap or are contiguous; a null reference otherwise.

Sample snippet

using NodaTime;
using System;

DateInterval firstInterval = new DateInterval(
    new LocalDate(2014, 3, 7),
    new LocalDate(2014, 3, 20));

DateInterval secondInterval = new DateInterval(
    new LocalDate(2014, 3, 15),
    new LocalDate(2014, 3, 23));

DateInterval? overlappingInterval = firstInterval.Union(secondInterval);

Console.WriteLine(overlappingInterval);

Output:

[2014-03-07, 2014-03-23]

Exceptions

Type	Condition
ArgumentException	interval uses a different calendar to this date interval.

Operators

Equality(DateInterval, DateInterval)

Compares two DateInterval values for equality. See the type documentation for a description of equality semantics.

Since 2.0.x

Availability netstandard2.0

Declaration

public static bool operator ==(DateInterval lhs, DateInterval rhs)

Parameters

Type	Name	Description
DateInterval	lhs	The first value to compare
DateInterval	rhs	The second value to compare

Returns

Type	Description
Boolean	True if the two date intervals have the same properties; false otherwise.

Inequality(DateInterval, DateInterval)

Compares two DateInterval values for inequality. See the type documentation for a description of equality semantics.

Since 2.0.x

Availability netstandard2.0

Declaration

public static bool operator !=(DateInterval lhs, DateInterval rhs)

Parameters

Type	Name	Description
DateInterval	lhs	The first value to compare
DateInterval	rhs	The second value to compare

Returns

Type	Description
Boolean	False if the two date intervals have the same start and end date; true otherwise.

Explicit Interface Implementations

IEnumerable.GetEnumerator()

Since 2.3.x

Availability netstandard2.0

Declaration

IEnumerator IEnumerable.GetEnumerator()

Returns

Type	Description
IEnumerator

Implements

System.IEquatable<T>

System.Collections.Generic.IEnumerable<T>

System.Collections.IEnumerable