Time Zone Converter
Convert times between any two time zones around the world
London / Dublin / Lisbon is 5h ahead of New York / Miami / Toronto
UTC-05:00 → UTC+00:00
Quick Time Picker
Quick Reference
| EST (UTC-05:00) | GMT (UTC+00:00) |
|---|---|
| 12:00 am | 05:00 am |
| 03:00 am | 08:00 am |
| 06:00 am | 11:00 am |
| 09:00 am | 02:00 pm |
| 12:00 pm | 05:00 pm |
| 03:00 pm | 08:00 pm |
| 06:00 pm | 11:00 pm |
| 09:00 pm | 02:00 am+1d |
Popular Time Zones — Current Time
Understanding Time Zones
Time zones are regions of the globe that observe a uniform standard time for legal, commercial, and social purposes. The world is divided into 24 primary time zones, each roughly 15 degrees of longitude wide, corresponding to the 24 hours in a day. However, political and geographic boundaries mean many countries adopt offsets that don't align perfectly with those 15-degree bands.
UTC: The Universal Reference
Coordinated Universal Time (UTC) is the primary time standard by which the world regulates clocks and time. It is based on International Atomic Time (TAI) with leap seconds added at irregular intervals to compensate for Earth's slowing rotation. UTC does not observe daylight saving time, making it a stable reference point used by aviation, the internet, financial markets, and scientific communities worldwide.
How Offsets Work
Positive Offsets (UTC+)
Zones east of the prime meridian are ahead of UTC. For example, Tokyo at UTC+9 is 9 hours ahead — when it's noon UTC, it's 9 PM in Tokyo.
Negative Offsets (UTC-)
Zones west of the prime meridian are behind UTC. New York at UTC-5 means when it's noon UTC, it's only 7 AM in New York.
Half-Hour Offsets
Some regions use unusual offsets. India (UTC+5:30), Iran (UTC+3:30), and Nepal (UTC+5:45) are well-known examples of non-whole-hour offsets.
Date Line Crossings
Converting across the International Date Line (near UTC+12 and UTC-12) can result in a day change — arriving the day before you left or a day later.
Daylight Saving Time (DST)
Many countries observe Daylight Saving Time (DST) by advancing clocks by one hour in spring and reverting in autumn. This shifts the effective UTC offset for those regions during summer months. For instance, the US Eastern time zone is UTC-5 in winter (EST) but UTC-4 in summer (EDT). Not all countries observe DST — countries near the equator, and many in Asia and Africa, keep a fixed offset year-round.
Key Time Zones at a Glance
EST / EDT — UTC-5/-4
Eastern US & Canada. Major financial hub including New York Stock Exchange.
GMT / BST — UTC+0/+1
United Kingdom. London is a key global financial center and aviation hub.
CET / CEST — UTC+1/+2
Central Europe. Paris, Berlin, Rome, Madrid — the heart of the Eurozone.
IST — UTC+5:30
India Standard Time. No DST observed. Used across the entire country.
CST — UTC+8
China Standard Time. Single zone for the entire country despite its large east-west span.
JST — UTC+9
Japan Standard Time. No DST. Tokyo is one of the world's largest financial markets.
Practical Tips for Scheduling Across Zones
- •Always confirm whether a location currently observes DST before scheduling — offsets can shift by an hour seasonally.
- •Use UTC as the common reference in technical documentation, APIs, and databases to avoid ambiguity.
- •When scheduling meetings between continents, consider the "overlap window" — business hours that fall within working time for all parties.
- •Trans-Pacific travel and calls often involve a date change — be explicit about which day of the week a time refers to.