timed

{{notability|Products|date=December 2018}}

{{Short description|Software that maintains time synchronization}}

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timed (time daemon) is an operating system program that maintains the system time in synchronization with time servers using the Time Synchronization Protocol (TSP) developed by Riccardo Gusella and Stefano Zatti.{{cite tech report |last1=Gusella |first1=Riccardo |last2=Zatti |first2=Stefano |title=The Berkeley UNIX 4.3BSD Time Synchronization Protocol |url=http://xtf.lib.berkeley.edu/reports/TRWebData/accessPages/CSD-85-250.html |number=CSD-85-250 |institution=Computer Science Division (EECS) University of California, Berkeley |date=June 1985}} Gusella and Zatti had done earlier related work on their TEMPO algorithm.{{cite tech report |last1=Gusella |first1=Riccardo |last2=Zatti |first2=Stefano |title=TEMPO: A Network Time Controller for a Distributed Berkeley UNIX System |url=http://xtf.lib.berkeley.edu/reports/TRWebData/accessPages/CSD-83-163.html |number=CSD-83-163 |institution=Computer Science Division (EECS) University of California, Berkeley |date= December 1983}} The Time Synchronization Protocol specification refers to an election algorithm{{cite tech report |last1=Gusella |first1=Riccardo |last2=Zatti |first2=Stefano |title=An Election Algorithm for a Distributed Clock Synchronization Program |url=http://xtf.lib.berkeley.edu/reports/TRWebData/accessPages/CSD-86-275.html |number=CSD-86-275 |institution=Computer Science Division (EECS) University of California, Berkeley |date=December 1985}} and a synchronization mechanism specified in other technical reports listed as "to appear".

With the release of macOS High Sierra in 2017, timed in macOS has subsumed all time synchronization responsibilities including those of the former ntpd and timed.{{cite web |author1=hoakley |date=2017-10-27 |df=mdy |title=Has anyone got the time? How High Sierra has changed time synchronisation |url=https://eclecticlight.co/2017/10/27/has-anyone-got-the-time-how-high-sierra-has-changed-time-synchronisation/ |website=The Eclectic Light Company |accessdate=2018-12-07}}