timed (time
daemon) is an
operating system program that maintains the
system time
In computer science and computer programming, system time represents a computer system's notion of the passage of time. In this sense, ''time'' also includes the passing of days on the calendar.
System time is measured by a ''system clock'', w ...
in synchronization with time servers using the Time Synchronization Protocol (TSP) developed by Riccardo Gusella and Stefano Zatti. Gusella and Zatti had done earlier related work on their TEMPO algorithm. The Time Synchronization Protocol specification refers an election algorithm and a synchronization mechanism specified in other technical reports listed as "to appear".
With the release of
macOS High Sierra
macOS High Sierra (version 10.13) is the fourteenth major release of macOS, Apple Inc.'s desktop operating system for Macintosh computers. macOS High Sierra was announced at the WWDC 2017 on June 5, 2017 and was released on September 25, 2017 ...
in 2017, timed in
macOS
macOS (; previously OS X and originally Mac OS X) is a Unix operating system developed and marketed by Apple Inc. since 2001. It is the primary operating system for Apple's Mac computers. Within the market of desktop and la ...
has subsumed all time synchronization responsibilities including those of the former
ntpd
The Network Time Protocol daemon (ntpd) is an operating system program that maintains the system time in synchronization with time servers using the Network Time Protocol (NTP).
Description
The ntpd program is an operating-system daemon that s ...
and timed.
See also
*
Network Time Protocol
The Network Time Protocol (NTP) is a networking protocol for clock synchronization between computer systems over packet-switched, variable- latency data networks. In operation since before 1985, NTP is one of the oldest Internet protocols in ...
(NTP)
*
Precision Time Protocol (IEEE 1588 PTP)
References
External links
timed(8) man page*
', System Manager's Manual (SMM:11)
*
', System Manager's Manual (SMM:12)
Network time-related software
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