Dating time

This matches the definition of the “proleptic Gregorian” calendar in Dershowitz and Reingold’s book Calendrical Calculations, where it’s the base calendar for all computations.See the book for algorithms for converting between proleptic Gregorian ordinals and many other calendar systems.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.A naive object does not contain enough information to unambiguously locate itself relative to other date/time objects.Whether a naive object represents Coordinated Universal Time (UTC), local time, or time in some other timezone is purely up to the program, just like it is up to the program whether a particular number represents metres, miles, or mass.

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Several additional directives not required by the C89 standard are included for convenience.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.In the Eastern example, UTC times of the form 5: MM and 6: MM both map to 1: MM when converted to Eastern, but earlier times have the The Time Zone Database (often called tz, tzdata or zoneinfo) contains code and data that represent the history of local time for many representative locations around the globe.An example of a time zone the default implementation may not handle correctly in all cases is one where the standard offset (from UTC) depends on the specific date and time passed, which can happen for political reasons.The default implementations of subclass accounting for both standard and daylight time, at the DST transition points.

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