Time Zone Converter
Convert date and time between any two world time zones. See live clocks, DST-aware results, and a world clock grid.
Everyday Uses
Global meeting planning
"9 AM in New York" — is that lunchtime or midnight for your team in Singapore? Schedule calls everyone can humanly attend.
Calling family abroad
Check the local time before calling relatives overseas — thoughtfulness starts with not waking them at 3 AM.
Flight arrival math
Departure and arrival times are in local zones — convert to figure out the actual flight length and jet lag ahead.
Live events
A launch at "18:00 UTC" or a match at "8 PM ET" — convert to your local time so you don't miss the moment.
Frequently Asked Questions
What is UTC and how does it differ from GMT?
UTC (Coordinated Universal Time) is the primary global time standard — it does not observe Daylight Saving Time and never changes. GMT (Greenwich Mean Time) is technically a time zone (UTC+0), but in casual use it refers to the same thing. The difference is subtle: GMT is based on mean solar time at the Greenwich meridian; UTC is a precise atomic-clock-based standard that is kept within 0.9 seconds of mean solar time using "leap seconds." For practical purposes, UTC = GMT. All other time zones are expressed as UTC offsets (e.g. UTC+5:30 for India).
What is Daylight Saving Time (DST) and which countries observe it?
DST is the practice of advancing clocks by 1 hour in spring (losing an hour of morning light, gaining evening light) and reverting in autumn. It was introduced during WWI to save energy. Countries observing DST: USA, Canada, most of Europe, Australia, New Zealand, and about 70 countries total. Countries that do NOT observe DST: China, Japan, India, most of Africa, most of Southeast Asia, and Russia (abolished in 2014). The EU voted to abolish DST but has not yet implemented the change. DST dates differ between regions — the US and Europe switch on different dates, causing temporary offsets.
How many time zones are there in the world?
There are 24 "standard" time zones based on whole-hour UTC offsets, but the actual number is closer to 38–40 due to half-hour offsets (India: UTC+5:30; Iran: UTC+3:30; Afghanistan: UTC+4:30), quarter-hour offsets (Nepal: UTC+5:45), and political decisions where regions choose offsets for economic or social reasons. China spans 5 natural time zones but uses a single zone (UTC+8). Russia has 11 time zones. The US contiguous states span 4 zones (EST/CST/MST/PST).
What are the major world time zones and their UTC offsets?
Key global time zones: UTC−5: US Eastern Standard Time (EST); New York, Toronto. UTC−6: US Central Standard Time; Chicago, Mexico City. UTC−7: US Mountain Standard Time; Denver. UTC−8: US Pacific Standard Time (PST); Los Angeles, Vancouver. UTC+0: London (GMT/WET), Lisbon, Reykjavik. UTC+1: Paris, Berlin, Rome, Madrid (CET). UTC+2: Cairo, Athens, Helsinki (EET). UTC+3: Moscow, Nairobi, Istanbul. UTC+5:30: India (IST). UTC+8: Beijing, Singapore, Hong Kong, Perth. UTC+9: Tokyo, Seoul. UTC+10: Sydney (AEST). UTC+12: Auckland.
How do you convert between time zones without errors?
The safest method: convert your local time to UTC first, then add or subtract the target zone's UTC offset. Example: converting 3:00 PM EST (UTC−5) to Tokyo (UTC+9): 3:00 PM + 5 hours = 8:00 PM UTC; 8:00 PM UTC + 9 hours = 5:00 AM next day Tokyo time. Common pitfalls: forgetting DST transitions (clocks change on different dates in different countries); day-boundary crossings (going past midnight changes the date); and some zones cross the International Date Line (UTC+12/−12 are only 1 minute apart but a full calendar day different).