Unix time[a] is a date and time representation widely used in computing. It measures time by the number of seconds that have elapsed since 00:00:00 UTC on 1 January 1970 excluding leap seconds, this is called the Unix epoch. For example, at midnight on January 1 2010, Unix time was 1262304000.
Unix time originated as the system time of Unix operating systems. It has come to be widely used in other computer operating systems, file systems, programming languages, and databases. In modern computing, values are sometimes stored with higher granularity, such as microseconds or nanoseconds.
- ^ Farhad, Manjoo (8 September 2001). "Unix Tick Tocks to a Billion". Wired. ISSN 1059-1028. Archived from the original on 11 September 2022. Retrieved 16 October 2022.
- ^ "The Open Group Base Specifications Issue 7, Rationale: Base Definitions, section A.4 General Concepts". The Open Group. Archived from the original on 15 November 2017. Retrieved 9 September 2019.
- ^ "The Open Group Base Specifications Issue 7, section 4.16 Seconds Since the Epoch". The Open Group. Archived from the original on 22 December 2017. Retrieved 22 January 2017.
- ^ Matthew, Neil; Stones, Richard (2008). "The Linux Environment". Beginning Linux Programming. Indianapolis, Indiana, US: Wiley. p. 148. ISBN 978-0-470-14762-7.
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