I couldn't believe there isn't a site that does such a simple thing. The funniest result i saw was telling me the local time in Millis, Massachusetts. There was nothing like it in the search results. Since a program was already running, rather than just inspecting Java's System.currentTimeMillis() or running a program that shows it to me, i figured i'll open a web page that shows it. Why 1970 you ask? It's just a convention: it was the roundest most recent year to the point in time people actually started thinking about a universal measure of time.Īs i was debugging i needed something to tell me what the current time in ms is. This number has to be so large that it can encompass all the time passed since midnight January 1st, 1970 but sufficiently small that it can fit into existing data structures and keep going enough time in the future. In Android you tell an alarm when to come up by passing a simple number. The "current millis" story started with me debugging my Android application. More importantly, this site offers a time navigation service for human users and a time authority service for programmatic usage. You can also convert milliseconds to date & time and the other way around. This site provides the current time in milliseconds elapsed since the UNIX epoch (Jan 1, 1970) as well as in other common formats including local / UTC time comparisons. From this point of view the name “GMT” seems deprecated, but kept around for backward compatibility, traditional timezone based representation of time and sometimes legal reasons. If you were to calculate true GMT today i would see it based on its original definition of 1 second = 1/86400 days and this would for sure return a different absolute value than what UTC gives us. These 2 turning points (different definition of a second and the introduction of leap seconds) ‘forced’ GMT to be the same as UTC based on what seemed a gradual, tacit convention. In 1972 leap seconds were introduced to synchronize UTC time with solar time. UTC’s second is far more precise than GMT's original second. Unlike GMT which is based on solar time and originally calculated a second as a fraction of the time it takes for the Earth to make a full rotation around its axis, UTC calculates a second as “the duration of 9192631770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium 133 atom”. UTC essentially appeared in 1960, GMT being the ‘main thing’ until then. No Daylight Saving Time in UTCĭaylight Saving Time (DST) is not used for UTC as it is a time standard for all time zones.Literature and history are a bit ambiguous. However, many time zone boundaries are distorted by geographical and political factors. In theory, the UTC offsets countries use should reflect the local mean solar time. Two time components are added together to translate mean solar time to Coordinated Universal Time (UTC): International Atomic Time (TAI) measured by atomic clocks and Universal Time (UT1), the actual length of a day on Earth. For every 15 degrees of longitude east or west, mean solar time changes by 1 hour. Primarily, UTC is based on mean solar time at the prime meridian running through Greenwich, UK. The offset is expressed as either UTC- or UTC+ and the number of hours and minutes. All time zones are defined by their offset from UTC. UTC-Coordinated Universal Time-is the 24-hour time standard used as a basis for civil time today. The graph above shows that there is no clock change in UTC during 2022. Business Date to Date (exclude holidays).
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