scientific problems with carbon dating - Dateformat d m y dating

The local wall clock leaps from (daylight time) back to (standard time) again. mimics the local clock’s behavior by mapping two adjacent UTC hours into the same local hour then.

Supporting timezones at deeper levels of detail is up to the application.

The rules for time adjustment across the world are more political than rational, change frequently, and there is no standard suitable for every application aside from UTC.

It is updated periodically to reflect changes made by political bodies to time zone boundaries, UTC offsets, and daylight-saving rules., each instance of which represents a timezone defined by a fixed offset from UTC.

Note that objects of this class cannot be used to represent timezone information in the locations where different offsets are used in different days of the year or where historical changes have been made to civil time. The following is a list of all the format codes that the C standard (1989 version) requires, and these work on all platforms with a standard C implementation.

For example, 2004 begins on a Thursday, so the first week of ISO year 2004 begins on Monday, and ends on Sunday, , so that Return a string representing the date, controlled by an explicit format string.

Format codes referring to hours, minutes or seconds will see 0 values.

For a complete list of formatting directives, see .

Used to disambiguate wall times during a repeated interval.

These parameters all correspond to ISO 8601 date values.

$format: (optional) If $type is 'custom', a PHP date format string suitable for input to date().

If the normalized value of days lies outside the indicated range, object represents a date (year, month and day) in an idealized calendar, the current Gregorian calendar indefinitely extended in both directions.

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