Time zone guides
Short, plain answers to the questions people search for most.
- How many time zones are there?Why the answer is not 24, and which places sit off the hour.
- UTC and GMT explainedThe clock every time zone is measured from, and how to read an offset.
- Daylight saving timeWho changes their clocks, when, and which countries never do.
- Time zone abbreviationsEST, IST, CET, AEST and the rest, with their UTC offsets.