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A typical NTP client regularly polls one or more NTP servers. The client must compute its time offset and round-trip delay. Time offset θ is positive or negative (client time > server time) difference in absolute time between the two clocks. It is defined by
This is a list of the UTC time offsets, showing the difference in hours and minutes from Coordinated Universal Time (UTC), from the westernmost (−12:00) to the easternmost (+14:00). It includes countries and regions that observe them during standard time or year-round.
So if the time being described is two hours ahead of UTC (such as in Kigali, Rwanda [approximately 30° E]), the UTC offset would be "+02:00", "+0200", or simply "+02". By convention, every inhabited place in the world has a UTC offset that is a multiple of 15 minutes but the majority of offsets are stated in whole hours.
{{UTC hour offset}} takes the current UTC time from the server, and applies an optional time offset in hours (or hours and minutes). It returns the computed local time in 24-hour format (hh:mm).
Standard Time (SDT) and Daylight Saving Time (DST) offsets from UTC in hours and minutes. For zones in which Daylight Saving is not observed, the DST offset shown in this table is a simple duplication of the SDT offset. The UTC offsets are based on the current or upcoming database rules.
Current civil time in a particular time zone can be determined by adding or subtracting the number of hours and minutes specified by the UTC offset, which ranges from UTC−12:00 in the west to UTC+14:00 in the east (see List of UTC offsets). The time zone using UTC is sometimes denoted UTC+00:00 or by the letter Z—a reference to the ...
A negative UTC offset describes a time zone west of the prime meridian where the civil time is behind UTC. So the zone designation for New York (on standard time) would be "−05:00","−0500", or "−05". Conversely, a positive UTC offset describes a time zone east of the prime meridian where the civil time is ahead of UTC. So the zone ...
Via BMCA, PTP selects a source of time for an IEEE 1588 domain and for each network segment in the domain. Clocks determine the offset between themselves and their leader. [13] Let the variable represent physical time. For a given follower device, the offset () at time is defined by: