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The integrity of system timestamps are extremely important for fraud detection by keeping track of precisely when financial transactions and other changes occur. By resetting the clock it is possible to misrepresent sequences of events.{{cn|date=April 2025}} With that in mind both [[Berkeley Software Distribution| BSD]] and [[GNU]] based Unix systems log both the before and after times when the clock is reset, including by the date command, in the [[utmp]] file.<ref>{{cite web| author=<!-- not stated --> | url=https://www.unix.com/man_page/bsd/5/utmp/https://www.unix.com/man_page/bsd/5/utmp/ | title=bsd man page for utmp| publisher=Unix Linux Community| website=community.unix.com | date=Nov 27, 1996 | access-date=April 27, 2025 }}</ref><ref> {{cite web | author=<!-- not stated --> | editor-last=Kerrisk| editor-first=Michael |url=https://man7.org/linux/man-pages/man5/utmp.5.html |website=man7.org | title=utmp(5) — Linux manual page |date=2024-09-01|___location= |publisher= |access-date=April 27, 2025}}</ref>
==Implementations in Other OS Environments==
===Multics===
[[Multics]] was a multi-user operating system from [[Honeywell]] that was a major inspiration for Unix. It had the following time and date related active functions which could be entered either directly on the command line or embedded in other commands using square brackets: '''date''', '''time''', '''date_time''', '''year''', '''month''' (number), '''month_name''', '''day '''(number), '''day_name''', '''hour''', '''minute'''.<ref>{{cite web| author=<!-- not stated --> | title=Multics Pocket Guide: Commands and Active Functions| date=April 1980 | url=https://multicians.org/multics-commands.html | website=www.bitsavers.org | publisher=Honeywelll|access-date=May 1, 2025}}</ref>
{{Expand section|date=May 1, 2025|further OS/shell examples}}
==History==
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