How time zones actually work, and how software gets them wrong.https://yourworldtime.com/enhttps://yourworldtime.com/guides/how-time-zones-work/https://yourworldtime.com/guides/how-time-zones-work/A time zone is not a slice of the globe — it is a named set of rules about what a clock in a particular place has read, does read, and is scheduled to read. That distinction is the whole subject.Thu, 15 Jan 2026 00:00:00 GMThow time zones worktime zone explainedwhat is a time zoneiana time zone databasehttps://yourworldtime.com/guides/what-utc-really-is/https://yourworldtime.com/guides/what-utc-really-is/UTC is not a time zone. It is the reference standard every time zone is defined against, maintained by around 450 atomic clocks, and it never changes for daylight saving — which is exactly why systems use it.Thu, 15 Jan 2026 00:00:00 GMTwhat is utcutc vs gmtcoordinated universal timeutc explainedhttps://yourworldtime.com/guides/why-daylight-saving-exists/https://yourworldtime.com/guides/why-daylight-saving-exists/Daylight saving was introduced to save fuel during the First World War, kept for reasons that have shifted every few decades, and is now being abandoned country by country as the evidence for it thins.Thu, 15 Jan 2026 00:00:00 GMTwhy daylight saving timedst historycountries abolished dstdaylight saving explainedhttps://yourworldtime.com/guides/scheduling-across-twelve-hours/https://yourworldtime.com/guides/scheduling-across-twelve-hours/A twelve-hour gap has no good meeting time, and no amount of grid-shading changes that. The teams that manage it well stop trying to find one and change how they work instead.Thu, 15 Jan 2026 00:00:00 GMTscheduling across time zonesremote team time zonestwelve hour time differenceasync workhttps://yourworldtime.com/guides/offsets-that-are-not-whole-hours/https://yourworldtime.com/guides/offsets-that-are-not-whole-hours/Around a fifth of the world lives on an offset that is not a whole number of hours from UTC. Software that assumes otherwise is not slightly wrong for those people — it is 30 or 45 minutes wrong, which is worse.Thu, 15 Jan 2026 00:00:00 GMThalf hour time zonesutc offset 45 minutesindia time zone offsetnepal time zonehttps://yourworldtime.com/guides/the-2038-problem/https://yourworldtime.com/guides/the-2038-problem/Systems storing time as a signed 32-bit second count run out of room in January 2038 and wrap to December 1901. Most modern platforms fixed this years ago; the exposure now is embedded, legacy and serialised data.Thu, 15 Jan 2026 00:00:00 GMT2038 problemyear 2038 bugunix timestamp overflowy2038https://yourworldtime.com/guides/iso-8601-explained/https://yourworldtime.com/guides/iso-8601-explained/ISO 8601 exists because 03/04/2026 is March in America and April everywhere else. Writing 2026-04-03 removes the ambiguity, sorts correctly as text, and is what every API should accept.Thu, 15 Jan 2026 00:00:00 GMTiso 8601date format standardtimestamp formatrfc 3339https://yourworldtime.com/guides/how-to-run-a-global-standup/https://yourworldtime.com/guides/how-to-run-a-global-standup/A daily standup works because everyone is awake at once. Past about a six-hour spread that stops being true, and the honest fix is to change the format rather than to keep shifting the time.Thu, 15 Jan 2026 00:00:00 GMTglobal standupasync standupdistributed team meetingsremote standup time zoneshttps://yourworldtime.com/guides/time-zones-in-code/https://yourworldtime.com/guides/time-zones-in-code/Almost every time zone bug traces to one of four mistakes. This is what to do instead, in JavaScript, Python, Java, Go and SQL, with the reasoning rather than just the rule.Thu, 15 Jan 2026 00:00:00 GMTtime zones in codedatetime best practicesstoring timestampsutc in databasehttps://yourworldtime.com/guides/why-est-is-ambiguous/https://yourworldtime.com/guides/why-est-is-ambiguous/Time zone abbreviations are informal labels with no governing body and no uniqueness guarantee. IST is India, Ireland and Israel; CST is America, China and Cuba. Use IANA identifiers instead.Thu, 15 Jan 2026 00:00:00 GMTest ambiguoustime zone abbreviationsist meaningcst timezonehttps://yourworldtime.com/guides/the-international-date-line/https://yourworldtime.com/guides/the-international-date-line/The International Date Line follows 180° longitude only loosely — it detours around Kiribati, Russia and the Aleutians, and countries have moved themselves across it for trade reasons.Thu, 15 Jan 2026 00:00:00 GMTinternational date linedate line explainedkiribati time zoneday before day afterhttps://yourworldtime.com/guides/half-hour-offsets-explained/https://yourworldtime.com/guides/half-hour-offsets-explained/India runs at UTC+05:30 because it split the difference between two proposed zones. Nepal runs at UTC+05:45 partly to not be India. Every unusual offset has a story, and most of them are political.Thu, 15 Jan 2026 00:00:00 GMTwhy india half hournepal 45 minuteshalf hour time zoneindia standard time history