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.
Scheduling across DST changes
Check a future date, since the offset between two cities shifts on the weeks their clocks change.
Remote work handovers
Find the overlap window when your working day intersects a colleague's in another zone.
Common conversions
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).