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Posted on 4/26/2021 3:55:51 PM | | | |
The unix timestamp is the number of seconds elapsed since January 1, 1970 (midnight UTC/GMT), regardless of leap seconds.

Unix timestamp (Unix epoch, Unix time, POSIX time, or Unix timestamp)

It is the number of seconds that have elapsed since January 1, 1970 (midnight UTC/GMT), not taking into account leap seconds.

Review:

.NET Core Timestamp Conversion (10-bit)
https://www.itsvse.com/thread-8933-1-1.html

C#/.NET timestamps, retrieval, transformations, and judgments, etc
https://www.itsvse.com/thread-3431-1-1.html

C# time and timestamp are 13 bits back-and-forth
https://www.itsvse.com/thread-2752-1-1.html

UTC and GMT

Greenwich Mean Time (GMT) refers to the standard time of the Royal Greenwich Observatory located on the outskirts of London, as the prime meridian is defined as the meridian through which it passes.

Coordinated Universal Time (UTC) English: Coordinated Universal Time, also known as: Universal Time, Universal Standard Time
International Coordinated Time, Coordinated Universal Time, also known as Universal Harmonized Time, Universal Standard Time, International Coordinated Time, abbreviated as UTC. It comes from the English "Coordinated Universal Time" / French "Temps Universel Cordonné".

GMT (Greenwish Mean Time), which is the folk name for UTC.GMT=UTC。

Beijing time=UTC+8=GMT+8.

Comparison table of world time zones

Time zone
Representative city
Standard time
Daylight Saving Time
Time zone ID
(UTC+04:30)KabulAfghanistan Standard TimeAfghanistan Daylight Saving TimeAfghanistan Standard Time
(UTC-09:00)AlaskaAlaska Standard TimeAlaska Daylight TimeAlaskan Standard Time
(UTC-10:00)Aleutian IslandsAleutian Islands Standard TimeAleutian Islands Daylight TimeAleutian Standard Time
(UTC+07:00)Barnaul, Gorno-AltayskAltai Standard TimeAltai Daylight TimeAltai Standard Time
(UTC+03:00)Riyadh, KuwaitArabic Standard TimeArabic Daylight Saving TimeArab Standard Time
(UTC+04:00)Abu Dhabi, MuscatArabian Standard TimeArabian Peninsula Daylight TimeArabian Standard Time
(UTC+03:00)BaghdadArabic Standard TimeArabic Daylight Saving TimeArabic Standard Time
(UTC-03:00)Buenos AiresArgentina Standard TimeArgentine Daylight TimeArgentina Standard Time
(UTC+04:00)Astrakhan, UlyanovskAstrakhan Standard TimeAstrakhan Daylight Saving TimeAstrakhan Standard Time
(UTC-04:00)Atlantic Time (Canada)Atlantic Standard TimeAtlantic Daylight TimeAtlantic Standard Time
(UTC+09:30)DarwinAustralian Central Standard TimeAustralian Central Daylight TimeAUS Central Standard Time
(UTC+08:45)EuclaWestern Australia Central Standard TimeAustralia Midwest Daylight TimeAus Central W. Standard Time
(UTC+10:00)Canberra, Melbourne, SydneyAustralian Eastern Standard TimeAustralian Eastern Daylight TimeAUS Eastern Standard Time
(UTC+04:00)BakuAzerbaijan Standard TimeAzerbaijan Daylight Saving TimeAzerbaijan Standard Time
(UTC-01:00)AzoresAzores Standard TimeAzores Daylight Saving TimeAzores Standard Time
(UTC-03:00)El SalvadorBahia Standard TimeBahia Daylight TimeBahia Standard Time
(UTC+06:00)DhakaBangladesh Standard TimeBangladesh Daylight Saving TimeBangladesh Standard Time
(UTC+03:00)MinskBelarus Standard TimeBelarusian Daylight Saving TimeBelarus Standard Time
(UTC+11:00)Bougainville IslandBougainville Island Standard TimeBougainville Island Daylight Saving TimeBougainville Standard Time
(UTC-06:00)SaskatchewanCanada Central Standard TimeCanadian Central Daylight TimeCanada Central Standard Time
(UTC-01:00)Cape Verde IslandsCape Verde Standard TimeCape Verde Daylight TimeCape Verde Standard Time
(UTC+04:00)YerevanCaucasus Standard TimeCaucasus Daylight Saving TimeCaucasus Standard Time
(UTC+09:30)AdelaideCentral Australian Standard TimeCentral Australian Daylight TimeCen. Australia Standard Time
(UTC-06:00)Central AmericaCentral American Standard TimeCentral American Daylight TimeCentral America Standard Time
(UTC+06:00)AstanaCentral Asian Standard TimeCentral Asian Summer TimeCentral Asia Standard Time
(UTC-04:00)CuiappaBrazil Central Standard TimeBrazil Central Daylight TimeCentral Brazilian Standard Time
(UTC+01:00)Belgrade, Bratislava, Budapest, Ljubljana, PragueCentral European Standard TimeCentral European Summer TimeCentral Europe Standard Time
(UTC+01:00)Sarajevo, Skopje, Warsaw, ZagrebStandard time in Central EuropeDaylight Saving Time in Central EuropeCentral European Standard Time
(UTC+11:00)Solomon Islands, New CaledoniaCentral Pacific Standard TimeCentral Pacific Daylight TimeCentral Pacific Standard Time
(UTC-06:00)Central Time (US and Canada)Central Standard TimeCentral Daylight TimeCentral Standard Time
(UTC-06:00)Guyalajara, Mexico City, MonterreyCentral Standard Time (Mexico)Central Daylight Time (Mexico)Central Standard Time (Mexico)
(UTC+12:45)Chatham IslandsChatham Islands Standard TimeChatham Islands Daylight TimeChatham Islands Standard Time
(UTC+08:00)Beijing, Chongqing, Hong Kong SAR, UrumqiChina Standard TimeChina Daylight TimeChina Standard Time
(UTC-05:00)HavanaCuban Standard TimeCuban Daylight Saving TimeCuba Standard Time
(UTC-12:00)International Date Line WestInternational Dateline Standard TimeInternational Date Line Daylight Saving TimeDateline Standard Time
(UTC+03:00)NairobiEast African Standard TimeEast African Daylight TimeE. Africa Standard Time
(UTC+10:00)BrisbaneEastern Australian Standard TimeEastern Australian Daylight TimeE. Australia Standard Time
(UTC+02:00)ChisinauEastern European Standard TimeEastern European Summer TimeE. Europe Standard Time
(UTC-03:00)BrasiliaEastern South American Standard TimeEastern South American Daylight TimeE. South America Standard Time
(UTC-06:00)Easter IslandEaster Island Standard TimeEaster Island Daylight Saving TimeEaster Island Standard Time
(UTC-05:00)Eastern Time (US and Canada)Eastern Standard TimeEastern Daylight TimeEastern Standard Time
(UTC-05:00)ChetumarEastern Standard Time (Mexico)Eastern Daylight Time (Mexico)Eastern Standard Time (Mexico)
(UTC+02:00)CairoEgyptian Standard TimeEgyptian Daylight TimeEgypt Standard Time
(UTC+05:00)YekaterinburgRussian TZ 4 Standard TimeRussian TZ 4 Daylight Saving TimeEkaterinburg Standard Time
(UTC+12:00)FijiFiji Standard TimeFiji Daylight TimeFiji Standard Time
(UTC+02:00)Helsinki, Kiev, Riga, Sofia, Tallinn, VilniusFLE Standard TimeFLE Daylight Saving TimeFLE Standard Time
(UTC+04:00)TbilisiGeorgian Standard TimeGeorgia Daylight TimeGeorgian Standard Time
(UTC+00:00)Dublin, Edinburgh, Lisbon, LondonGMT Standard TimeGMT Daylight Saving TimeGMT Standard Time
(UTC-03:00)GreenlandGreenland Standard TimeGreenland Daylight Saving TimeGreenland Standard Time
(UTC+00:00)Monrovia, ReykjavikGMTGreenwich Daylight TimeGreenwich Standard Time
(UTC+02:00)Athens, BucharestGTB Standard TimeGTB Daylight Saving TimeGTB Standard Time
(UTC-05:00)HaitiHaiti Standard TimeHaitian Daylight Saving TimeHaiti Standard Time
(UTC-10:00)HawaiiHawaii Standard TimeHawaii Daylight Saving TimeHawaiian Standard Time
(UTC+05:30)Chennai, Kolkata, Mumbai, New DelhiIndian Standard TimeIndian Daylight TimeIndia Standard Time
(UTC+03:30)TehranIran Standard TimeIran Daylight Saving TimeIran Standard Time
(UTC+02:00)JerusalemJerusalem Standard TimeJerusalem Daylight TimeIsrael Standard Time
(UTC+02:00)AmmanJordan Standard TimeJordan Daylight Saving TimeJordan Standard Time
(UTC+02:00)KaliningradRussian TZ 1 Standard TimeRussian TZ 1 Daylight Saving TimeKaliningrad Standard Time
(UTC+12:00)Petropavlovsk-KamchatkaKamchatka Standard TimeKamchatka Daylight Saving TimeKamchatka Standard Time
(UTC+09:00)SeoulKorean Standard TimeKorean Daylight Saving TimeKorea Standard Time
(UTC+02:00)TripoliLibyan Standard TimeLibyan Daylight Saving TimeLibya Standard Time
(UTC+14:00)Christmas IslandLane Islands Standard TimeLine Islands Daylight Saving TimeLine Islands Standard Time
(UTC+10:30)Lord Howe IslandLord Howe Island Standard TimeLord Howe Island Daylight Saving TimeLord Howe Standard Time
(UTC+11:00)MagadanMagadan Standard TimeMagadan Daylight TimeMagadan Standard Time
(UTC-09:30)Marquesas IslandsMarquesas Islands Standard TimeMarquesas Islands Daylight Saving TimeMarquesas Standard Time
(UTC+04:00)Port LouisMauritius Standard TimeMauritius Daylight Saving TimeMauritius Standard Time
(UTC-02:00)Mid-AtlanticMid-Atlantic Standard TimeMid-Atlantic Daylight TimeMid-Atlantic Standard Time
(UTC+02:00)BeirutMiddle East Standard TimeMiddle East Daylight TimeMiddle East Standard Time
(UTC-03:00)MontevideoMontevideo Standard TimeDaylight Saving Time in MontevideoMontevideo Standard Time
(UTC+00:00)CasablancaMoroccan Standard TimeMoroccan Daylight Saving TimeMorocco Standard Time
(UTC-07:00)Mountain Time (US and Canada)Mountain Standard TimeMountain Daylight Saving TimeMountain Standard Time
(UTC-07:00)Chihuahua, La Paz, MazatlanMountain Standard Time (Mexico)Mountain Daylight Time (Mexico)Mountain Standard Time (Mexico)
(UTC+06:30)YangonMyanmar Standard TimeMyanmar Daylight Saving TimeMyanmar Standard Time
(UTC+07:00)NovosibirskNovosibirsk Standard TimeNovosibirsk Daylight TimeN. Central Asia Standard Time
(UTC+01:00)WendellhockNamibian Standard TimeNamibia Daylight Saving TimeNamibia Standard Time
(UTC+05:45)KathmanduNepal Standard TimeNepal Daylight Saving TimeNepal Standard Time
(UTC+12:00)Auckland, WellingtonNew Zealand Standard TimeNew Zealand Daylight TimeNew Zealand Standard Time
(UTC-03:30)NewfoundlandNewfoundland Standard TimeNewfoundland Daylight TimeNewfoundland Standard Time
(UTC+11:00)Norfolk IslandNorfolk Island Standard TimeNorfolk Island Daylight Saving TimeNorfolk Standard Time
(UTC+08:00)IrkutskRussian TZ 7 Standard TimeRussian TZ 7 Daylight Saving TimeNorth Asia East Standard Time
(UTC+07:00)KrasnoyarskRussian TZ 6 Standard TimeRussian TZ 6 Daylight Saving TimeNorth Asia Standard Time
(UTC+08:30)PyongyangNorth Korean Standard TimeKorean Daylight Saving TimeNorth Korea Standard Time
(UTC+06:00)OmskOmsk Standard TimeOmsk Daylight TimeOmsk Standard Time
(UTC-04:00)San DiegoPacific South American Standard TimePacific South American Daylight TimePacific SA Standard Time
(UTC-08:00)Pacific Time (US and Canada)Pacific Standard TimePacific Daylight TimePacific Standard Time
(UTC-08:00)Baja CaliforniaPacific Standard Time (Mexico)Pacific Daylight Time (Mexico)Pacific Standard Time (Mexico)
(UTC+05:00)Islamabad, KarachiPakistan Standard TimePakistan Daylight Saving TimePakistan Standard Time
(UTC-04:00)AsuncionParaguay Standard TimeParaguay Daylight Saving TimeParaguay Standard Time
(UTC+01:00)Brussels, Copenhagen, Madrid, ParisRome Standard TimeRoman Daylight TimeRomance Standard Time
(UTC+11:00)Joe KurdakhRussian TZ 10 Standard TimeRussian TZ 10 Daylight Saving TimeRussia Time Zone 10
(UTC+12:00)Anadyr, Petropavlovsk-KamchatkaRussian TZ 11 Standard TimeRussian TZ 11 Daylight Saving TimeRussia Time Zone 11
(UTC+04:00)Izhevsk, SamaraRussian TZ 3 Standard TimeRussian TZ 3 Daylight Saving TimeRussia Time Zone 3
(UTC+03:00)Moscow, St. Petersburg, VolgogradRussian TZ 2 Standard TimeRussian TZ 2 Daylight Saving TimeRussian Standard Time
(UTC-03:00)Cayenne, FortalezaSouth American Eastern Standard TimeSouth American Eastern Daylight TimeSA Eastern Standard Time
(UTC-05:00)Bogotá, Lima, Quito, Rio BlancoSouth American Pacific Standard TimeSouth American Pacific Daylight TimeSA Pacific Standard Time
(UTC-04:00)Georgetown, La Paz, Manaus, San JuanWestern Standard TimeSouth American Western Daylight TimeSA Western Standard Time
(UTC-03:00)Saint Pierre and MiquelonSt. Pierre Standard TimeSaint Pierre Daylight TimeSaint Pierre Standard Time
(UTC+11:00)SakhalinSakhalin Standard TimeSakhalin Daylight TimeSakhalin Standard Time
(UTC+13:00)Samoa IslandsSamoa Islands Standard TimeSamoa Islands Daylight Saving TimeSamoa Standard Time
(UTC+07:00)Bangkok, Hanoi, JakartaSoutheast Asian Standard TimeSoutheast Asian Daylight TimeSE Asia Standard Time
(UTC+08:00)Kuala Lumpur, SingaporePeninsular Malaysia Standard TimePeninsular Malaysia Daylight TimeSingapore Standard Time
(UTC+02:00)Harare, PretoriaSouth African Standard TimeSouth African Daylight TimeSouth Africa Standard Time
(UTC+05:30)Sri Gaya WodenpuraSri Lanka Standard TimeSri Lanka Daylight TimeSri Lanka Standard Time
(UTC+02:00)DamascusSyrian Standard TimeSyrian Daylight TimeSyria Standard Time
(UTC+08:00)TaipeiTaipei Standard TimeTaipei Daylight Saving TimeTaipei Standard Time
(UTC+10:00)HobartTasmania Standard TimeTasmania Daylight TimeTasmania Standard Time
(UTC-03:00)AraguainaTocantins Standard TimeTocantins Daylight Saving TimeTocantins Standard Time
(UTC+09:00)Osaka, Sapporo, TokyoTokyo Standard TimeTokyo Daylight Saving TimeTokyo Standard Time
(UTC+07:00)TomskTomsk Standard TimeTomsk Daylight Saving TimeTomsk Standard Time
(UTC+13:00)Nuku AlofaTonga Standard TimeTonga Daylight Saving TimeTonga Standard Time
(UTC+09:00)Chita CityTransbaikal Standard TimeTransbaikal Daylight TimeTransbaikal Standard Time
(UTC+03:00)IstanbulTurkish Standard TimeTurkish Daylight Saving TimeTurkey Standard Time
(UTC-04:00)Turks and Caicos IslandsTurks and Caicos Islands Standard TimeTurks and Caicos Islands Daylight Saving TimeTurks And Caicos Standard Time
(UTC+08:00)UlaanbaatarUlaanbaatar Standard TimeUlaanbaatar Daylight Saving TimeUlaanbaatar Standard Time
(UTC-05:00)Indiana (Eastern)ESTEastern Daylight TimeUS Eastern Standard Time
(UTC-07:00)ArizonaUS Mountain Standard TimeU.S. Mountain Daylight TimeUS Mountain Standard Time
(UTC)Coordinated Universal TimeCoordinated Universal TimeCoordinated Universal TimeUTC
(UTC+12:00)Coordinated UTC +12UTC+12UTC+12UTC+12
(UTC-02:00)Coordinated Universal Time-02UTC-02UTC-02UTC-02
(UTC-08:00)Coordinated UTC-08UTC-08UTC-08UTC-08
(UTC-09:00)Coordinated Universal Time-09UTC-09UTC-09UTC-09
(UTC-11:00)Coordinated Universal Time-11UTC-11UTC-11UTC-11
(UTC-04:00)CaracasVenezuelan Standard TimeVenezuelan Daylight Saving TimeVenezuela Standard Time
(UTC+10:00)VladivostokRussian TZ 9 Standard TimeRussian TZ 9 Daylight Saving TimeVladivostok Standard Time
(UTC+08:00)PerthAustralian Western Standard TimeAustralian Western Daylight TimeW. Australia Standard Time
(UTC+01:00)Western Central AfricaCentral African Western Standard TimeCentral African Western Daylight TimeW. Central Africa Standard Time
(UTC+01:00)Amsterdam, Berlin, Bern, Rome, Stockholm, ViennaWestern European Standard TimeWestern European Summer TimeW. Europe Standard Time
(UTC+07:00)KobdoWestern Mongolia Standard TimeWestern Mongolian Daylight Saving TimeW. Mongolia Standard Time
(UTC+05:00)Ashgabat, TashkentWest Asian Standard TimeWestern Asian Daylight TimeWest Asia Standard Time
(UTC+02:00)Gaza, HebronWest Bank Gaza Standard TimeWest Bank Gaza Daylight Saving TimeWest Bank Standard Time
(UTC+10:00)Guam, Port MoresbyPacific Western Standard TimePacific Western Daylight TimeWest Pacific Standard Time
(UTC+09:00)YakutskRussian TZ 8 Standard TimeRussian TZ 8 Daylight Saving TimeYakutsk Standard Time


Many .NET/C# code on the Internet get the timestamp incorrectly, and the correct code is as follows:



The hyperlink login is visible.




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