Time Zone Converter
Convert any time between world time zones with automatic Daylight Saving Time handling. Includes UTC offset tables for major cities and non-standard time zones.
Enter your values above to see the results.
Tips & Notes
- ✓When scheduling international meetings, use UTC as the common reference point — let each participant convert to their local time to avoid confusion about Daylight Saving Time.
- ✓Phoenix, Arizona does not observe Daylight Saving Time — it stays on MST (UTC-7) year-round, sharing UTC-7 with California in summer but being 1 hour ahead in winter.
- ✓India (UTC+5:30) and Nepal (UTC+5:45) use non-standard half and quarter-hour offsets — always verify to the minute when scheduling with these regions.
- ✓The International Date Line runs through the Pacific at 180 degrees longitude — crossing it westward adds a day, eastward subtracts a day.
- ✓Always specify Standard or Daylight time when communicating across regions — 2 PM Eastern means UTC-5 in winter or UTC-4 in summer depending on the date.
Common Mistakes
- ✗Forgetting that Daylight Saving Time changes the UTC offset — New York is UTC−5 in winter (EST) and UTC−4 in summer (EDT). A call scheduled at the same clock time spans a different UTC time depending on the season.
- ✗Assuming all countries observe DST — Japan, China, India, the UAE, and most of equatorial Africa do not observe DST. Their UTC offset is constant year-round, which means their offset relative to the US and Europe changes when those regions transition.
- ✗Confusing AM/PM when crossing midnight in time zone conversion — converting 10:00 PM New York to Tokyo time adds 14 hours, giving 12:00 PM the next day in Tokyo. The date changes, not just the hour.
- ✗Using a fixed offset without checking current DST status — London is UTC+0 in winter (GMT) and UTC+1 in summer (BST). Using UTC+0 for a summer meeting gives the wrong result by one hour.
- ✗Treating China Standard Time as a single zone for all of China — China uses a single national time zone (UTC+8) for all its territory, meaning western China (which geographically should be UTC+6) is on the same official time as eastern China.
Time Zone Converter Overview
A time zone converter translates a specific time from one time zone to another, accounting for UTC offsets, Daylight Saving Time transitions, and the international date line. With remote work spanning continents, international conference calls, and global travel, the ability to convert time zones accurately — knowing not just the hour difference but whether the date changes too — has become an everyday necessity.
Time zone conversion formula:
Target Time = Source Time + (Target UTC Offset − Source UTC Offset)
EX: New York (UTC−5 in winter) to London (UTC+0): 3:00 PM EST + 5 hours = 8:00 PM GMT | In summer (EDT UTC−4): 3:00 PM EDT + 4 hours = 7:00 PM BSTMajor world time zones — UTC offsets and key cities:
| Time Zone | UTC Offset (Standard) | UTC Offset (DST) | Major Cities |
|---|---|---|---|
| EST / EDT | UTC−5 | UTC−4 (Mar–Nov) | New York, Miami, Toronto |
| CST / CDT | UTC−6 | UTC−5 (Mar–Nov) | Chicago, Dallas, Mexico City |
| MST / MDT | UTC−7 | UTC−6 (Mar–Nov) | Denver, Phoenix (no DST), Salt Lake City |
| PST / PDT | UTC−8 | UTC−7 (Mar–Nov) | Los Angeles, Seattle, Vancouver |
| GMT / BST | UTC+0 | UTC+1 (Mar–Oct) | London, Dublin, Lisbon |
| CET / CEST | UTC+1 | UTC+2 (Mar–Oct) | Paris, Berlin, Rome, Amsterdam |
| EET / EEST | UTC+2 | UTC+3 (Mar–Oct) | Cairo, Athens, Helsinki, Kyiv |
| GST | UTC+4 | No DST | Dubai, Abu Dhabi |
| IST | UTC+5:30 | No DST | Mumbai, Delhi, Kolkata |
| CST (China) | UTC+8 | No DST | Beijing, Shanghai, Hong Kong |
| JST | UTC+9 | No DST | Tokyo, Osaka, Seoul |
| AEDT / AEST | UTC+10/+11 | Varies by state | Sydney, Melbourne, Brisbane |
| Meeting Time (UTC) | New York | London | Dubai | Singapore | Sydney |
|---|---|---|---|---|---|
| 08:00 UTC | 3:00 AM ❌ | 8:00 AM ✅ | 12:00 PM ✅ | 4:00 PM ✅ | 6:00 PM ✅ |
| 13:00 UTC | 8:00 AM ✅ | 1:00 PM ✅ | 5:00 PM ✅ | 9:00 PM ❌ | 11:00 PM ❌ |
| 15:00 UTC | 10:00 AM ✅ | 3:00 PM ✅ | 7:00 PM ✅ | 11:00 PM ❌ | 1:00 AM ❌ |
| 17:00 UTC | 12:00 PM ✅ | 5:00 PM ✅ | 9:00 PM ❌ | 1:00 AM ❌ | 3:00 AM ❌ |
Frequently Asked Questions
UTC (Coordinated Universal Time) is the primary international time standard, maintained by atomic clocks and essentially equivalent to GMT (Greenwich Mean Time) for practical purposes. It has no offset, no Daylight Saving Time adjustment, and does not change with seasons. Aviation, internet infrastructure, scientific computing, financial markets, and international communications all use UTC as the universal reference point. Converting between any two time zones is done by finding each zone offset from UTC and calculating the difference.
Pacific Time is 3 hours behind Eastern Time (UTC−8 vs UTC−5 in standard time, UTC−7 vs UTC−4 in daylight saving time). Subtract 3 hours from ET to get PT. Example: 2:00 PM ET = 11:00 AM PT. In summer (EDT/PDT): the difference is still 3 hours. Exception: during the 2-week window when one US zone has transitioned but the other has not (early March and early November), the difference may temporarily be 2 or 4 hours.
Daylight Saving Time (DST) advances clocks 1 hour forward in spring and 1 hour back in autumn, shifting the UTC offset by 1 hour for part of the year. The US, Canada, most of Europe, parts of Australia, and some other countries observe DST. Countries near the equator (India, Singapore, UAE, Japan, China, most of Africa) do not observe DST because seasonal daylight variation is minimal. The transition dates differ by region: US in March and November, Europe in March and October, Australia in October and April.
Use UTC as the anchor. Find the UTC offset for each participant location. Look for a UTC time window where all locations fall between 08:00 and 18:00 local time. For US East Coast + London + Singapore: 13:00 UTC = 8 AM NY + 1 PM London + 9 PM Singapore. This is the best overlap window — NY and London are in standard business hours; Singapore is workable but after-hours. No single time works perfectly for all three — choose the option that burdens the smallest or least-critical group.
The International Date Line (IDL) runs roughly along the 180th meridian in the Pacific Ocean. Crossing it westbound (traveling from Americas toward Asia/Australia) — the date advances by one day. Crossing it eastbound (traveling from Asia/Australia toward Americas) — the date moves back by one day. This is why a flight leaving Los Angeles Monday evening can arrive in Sydney Wednesday morning despite being a ~15-hour flight: the westbound crossing adds one calendar day.
India Standard Time (IST) is UTC+5:30, chosen in 1947 to create a single national time zone that represents a geographic compromise between the eastern and western extremes of the country. Nepal goes further with UTC+5:45. Iran uses UTC+3:30. These non-standard offsets exist because countries chose times that best balanced national geographic coverage rather than aligning with the nearest whole-hour UTC offset. They are fully valid UTC offsets — just less common than whole-hour ones.