Clear, practical explanations of how time zones, daylight saving and international scheduling really work — every table is calculated from the IANA time zone database, so the numbers match our converters.
Convert IST to EST (and EDT) in seconds: the formula, a cheat sheet of common times, 2026 daylight-saving dates and the mistakes that cause missed calls.
EST is UTC−5 and EDT is UTC−4. Learn when each applies, the 2026 switch dates, why ET is safer to write, and which places stay on EST all year.
India and the US barely share working hours. See the best meeting windows for Eastern, Central and Pacific time in winter and summer, with a fairness plan.
UTC and GMT show the same clock time, but they are not the same thing. Understand leap seconds, why London is not on GMT in summer, and which to use.
When do the clocks change in 2026? Exact dates and times for the US, Canada, UK, Europe, Australia, New Zealand and more, plus where DST is never used.
24 zones on paper, dozens of different offsets in practice. See why some are 30 or 45 minutes off, which countries use one zone, and how IANA counts them.
The six main US time zones with abbreviations, UTC offsets and example cities, plus split states, places without daylight saving and US territories.
Twelve practical rules for remote teams to schedule fairly across time zones: golden hours, rotating pain, async-first habits and calendar settings.
IST is UTC+5:30 all year, for the whole of India. Learn why the offset has 30 minutes, how it compares with major cities, and the other meanings of IST.
Three quick mental methods to convert any time zone, with worked examples, a midnight check and the daylight-saving traps that cause most mistakes.
Looking for a tool instead? Try the world clock & converter, the meeting planner or the IST to EST converter.