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  2. List of UTC offsets - Wikipedia

    en.wikipedia.org/wiki/List_of_UTC_offsets

    This is a list of the UTC time offsets, showing the difference in hours and minutes from Coordinated Universal Time (UTC), from the westernmost (−12:00) to the easternmost (+14:00). It includes countries and regions that observe them during standard time or year-round.

  3. Coordinated Universal Time - Wikipedia

    en.wikipedia.org/wiki/Coordinated_Universal_Time

    This is an accepted version of this page This is the latest accepted revision, reviewed on 4 February 2025. Primary time standard "UTC" redirects here. For the time zone between UTC−1 and UTC+1, see UTC+00:00. For other uses, see UTC (disambiguation). It has been suggested that UTC offset be merged into this article. (Discuss) Proposed since December 2024. Current time zones Coordinated ...

  4. Time zone - Wikipedia

    en.wikipedia.org/wiki/Time_zone

    The use of local time for time-stamping records is not recommended for time zones that implement daylight saving time because once a year there is a one-hour period when local times are ambiguous. Calendar systems nowadays usually tie their time stamps to UTC, and show them differently on computers that are in different time zones.

  5. List of time zone abbreviations - Wikipedia

    en.wikipedia.org/wiki/List_of_time_zone...

    Such designations can be ambiguous; for example, "CST" can mean China Standard Time (UTC+08:00), Cuba Standard Time (UTC−05:00), and (North American) Central Standard Time (UTC−06:00), and it is also a widely used variant of ACST (Australian Central Standard Time, UTC+9:30). Such designations predate both ISO 8601 and the internet era; in ...

  6. C date and time functions - Wikipedia

    en.wikipedia.org/wiki/C_date_and_time_functions

    converts a time_t value to calendar time expressed as local time mktime: converts calendar time to a time_t value. Constants CLOCKS_PER_SEC: number of processor clock ticks per second TIME_UTC: time base for UTC Types struct tm: broken-down calendar time type: year, month, day, hour, minute, second time_t

  7. Universal Time - Wikipedia

    en.wikipedia.org/wiki/Universal_Time

    Apart from Nepal Standard Time (UTC+05:45), the Chatham Standard Time Zone (UTC+12:45) used in New Zealand's Chatham Islands [17] and the officially unsanctioned Central Western Time Zone (UTC+8:45) used in Eucla, Western Australia and surrounding areas, all time zones in use are defined by an offset from UTC that is a multiple of half an hour ...

  8. UTC offset - Wikipedia

    en.wikipedia.org/wiki/UTC_offset

    The UTC offset is the difference in hours and minutes between Coordinated Universal Time (UTC) and the standard time at a particular place. [1] This difference is expressed with respect to UTC and is generally shown in the format ±[hh]:[mm] , ±[hh][mm] , or ±[hh] .

  9. Leap second - Wikipedia

    en.wikipedia.org/wiki/Leap_second

    Screenshot of the UTC clock from time.gov during the leap second on 31 December 2016.. A leap second is a one-second adjustment that is occasionally applied to Coordinated Universal Time (UTC), to accommodate the difference between precise time (International Atomic Time (TAI), as measured by atomic clocks) and imprecise observed solar time (), which varies due to irregularities and long-term ...