UTC

Zero meridian hours

UTC stands for Coordinated Universal Time, the primary time standard by which the world regulates clocks.

It replaced Greenwich Mean Time as the international reference point.

Time zones are expressed as offsets from UTC: The server logs timestamps in UTC, The meeting is at 14:00 UTC.

The abbreviation derives from a compromise between English and French word order.

zones

GMT

Global time baseline

GreenwichLondon district, meridian origin
ZuluBantu language of Natal
ESTUTC minus five

PST · CST · MST · EDT · offset · conversion · local time · dateline · meridian · longitude

standard

atomic

Of elemental particles

cesiumAlkali metal, number fifty-five
synchronizationAligning timing across systems
calibrationAdjusting for measurement accuracy

frequency · metrology · timekeeping · chronometry · precision · nanoseconds · accuracy · international · reference · epoch

computing

timestamp

Recorded moment identifier

epochDistinct historical period
synchronizationAligning timing across systems
NTPClock synchronization protocol

server · database · logging · API · scheduling · conversion · parsing · format · milliseconds · coordination

astronomy

solar time

Timekeeping by sun position

siderealOf the stars
earth rotationPlanet's turning on axis
mean timeIntervening time span

observatory · navigation · celestial · astronomical · equinox · transit

Categories

timesecond, minute, hour, day, seconds
timekeepingclock, watch, watches, clocks, timer
time conceptsclock, calendar, hour, minute, second
standardsstandard, standards, norm, norms, criterion
time servicesatomic clock, time zone, NTP, world clock, time stamp
time zonesEST, PST, GMT, CST, MST

Opposites

time reference scope

Current hour nearby

time zone · PST · EST · CST · MST

time standard precision

Timekeeping by sun position

Familiarity: Top 500,000
Profile: Used worldwide · Timeless · Abstract · Rated G