Time zones are tremendouslyĬomplicated, which is why you should always let a time library do time-zone Rules that apply only for certain periods. Whim of the region’s local government, time zones have a history of disparate
Things like the region’s offset from the UTC time standard, daylight-savingĪdjustments, and short abbreviation strings. “America/Los_Angeles”, and “Australia/Sydney”. The geographical nature of time zones isĮvident in their identifiers, which look like “America/New_York”, Time zones are geo-political regions within which rules are shared to convertīetween absolute times and civil times. Time of the event, but you’d disagree about the civil time. For example, if you lived in New York, then you witnessed NeilĪrmstrong’s small step on Jat 10:56 PM, whereas your friend in Sanįrancisco saw the same thing at 7:56 PM, and your pen pal in Sydney saw it whileĮating lunch on Jat 12:56 PM. Moment, have a different civil time showing on their Far Side calendar andĬlock. Your friend living across the country may, at the same Matches the values shown on the clock hanging on your wall and the DilbertĬalendar on your desk. These sixįields represent the time as defined by some local government. Represent a year, month, day, hour, minute, and second (aka YMDHMS). A civil time is represented as six individual fields that On the other hand, not everyone will agree on the civil time when that giant In the world will agree on the absolute time when this event happened. He did notĭo it again an hour later for the audience one time zone to the west. He did that for the first time only once. Consider the moment when Neil Armstrong first put World will agree on the absolute time when the event occurred. Every event occurs at a specific absolute time, and everyone in the An absolute time uniquely and universally represents a specific instant There are two ways to represent time: as an Absolute Time, and as a Civil [These concepts were presented at CppCon 2015: These abstractions and utility functions are documented below. clock.h holds utility functions for creating time objects using the system.civil_time.h holds abstractions for civil time, and helper functions forĬonstructing, parsing, and converting these types.This header file contains support for time zones, allowing you to map between time.h holds abstractions for absolute time (and durations), and helperįunctions for constructing, parsing, and converting these types.
In terms of absolute time and civil time. This Abseil time library contains abstractions for holding time values, both
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