![]() ![]() Such representation of time is mainly for internal use. When times prior to the epoch need to be represented, it is common to use the same system, but with negative numbers. For example, for an epoch date of midnight UTC (00:00) on 1 January 1900, and a time unit of a second, the time of the midnight (24:00) between 1 January 1900 and 2 January 1900 is represented by the number 86400, the number of seconds in one day. Software timekeeping systems vary widely in the resolution of time measurement some systems may use time units as large as a day, while others may use nanoseconds. Ĭomputing epochs are nearly always specified as midnight Universal Time on some particular date. Windows NT systems, up to and including Windows 11 and Windows Server 2022, measure time as the number of 100-nanosecond intervals that have passed since 1 January 1601 00:00:00 UTC, making that point in time the epoch for those systems. For instance, Unix and POSIX measure time as the number of seconds that have passed since Thursday 1 January 1970 00:00:00 UT, a point in time known as the Unix epoch. Most computer systems determine time as a number representing the seconds removed from a particular arbitrary date and time. In computing, an epoch is a constant date and time used as a reference from which a computer measures system time. For other uses, see Epoch (disambiguation). This article is about the broad concept of time measurement in computing. ![]()
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