LocalDateTime type supports the following patterns:
The following standard patterns are supported:
O: The BCL round-trip pattern, which is always "uuuu'-'MM'-'dd'T'HH':'mm':'ss'.'fffffff" using the
invariant culture. The calendar system is not round-tripped in this pattern, but it's compatible with the
BCL round-trip pattern (for
DateTime values with a
Unspecified, which is closest in meaning to
LocalDateTime). Note that this only has 7 decimal digits for sub-second precision, so it can lose data
for values which have a non-zero "nanosecond of tick". This lack of precision is maintained for compatibility
with the BCL. Use
R for the equivalent pattern with 9 digits of sub-second precision.
r: The full round-trip pattern including calendar system, which is always "uuuu'-'MM'-'dd'T'HH':'mm':'ss'.'fffffffff '('c')'" using the invariant culture.
R: The full round-trip pattern without calendar system, which is always "uuuu'-'MM'-'dd'T'HH':'mm':'ss'.'fffffffff" using the invariant culture.
s: The sortable pattern, which is always "uuuu'-'MM'-'dd'T'HH':'mm':'ss" using the invariant culture. (Note: this is only truly sortable for years within the range [0-9999].)
F: The full date and time pattern as defined by the culture's
For example, in the invariant culture this is "dddd, dd MMMM yyyy HH:mm:ss".
The custom format patterns for local date and time values are provided by combining the custom patterns for
the custom patterns for
LocalTime. The result is simply the combination of the date and the time.
There are two exceptions to this:
LocalDateTime, an 24-hour (
HH) specifier is allowed to have the value 24, instead of being limited to the range 00-23. This is only permitted if the resulting time of day is midnight, and it indicates the end of the specified day. The result is midnight on the following day. For example, using the ISO pattern, the values
2012-11-25T00:00:00are equivalent. A value of 24 is never produced when formatting.
Additionally, a specifier of
lt<...> is used to embed a
LocalTime pattern (which may be a standard pattern)
in a custom pattern, and likewise a specifier of
ld<...> is used to embed a
LocalDate pattern. For example, a custom
'Date: ' ld<d>'; Time: ' lt<T> will use the standard short format date pattern, and the standard long format
time pattern for the appropriate culture for the date and time parts.