UTC Converter Time Zone Converter with DST — World Clock, Meeting Planner & Unix Timestamp
Convert any date and time between 40+ timezones with full automatic DST (Daylight Saving Time) handling using the browser’s built-in IANA timezone database. Select a source timezone, enter date and time, choose the destination — and see the converted time instantly, including the UTC offset, timezone abbreviation, and ISO 8601 formatted string. The live world clock shows the current time in 10 major cities, updating every second. The meeting planner grid shows your proposed time across 6 customisable cities with colour-coded business/night hour indicators so you can find a window that works for everyone. The Unix timestamp converter turns any Unix epoch into a human-readable local time in any timezone. Covers UTC to EST, PST to UTC, UTC to IST, UTC to CST, GMT to local and all UTC offsets from UTC−12 to UTC+14. All calculations are browser-side — nothing sent anywhere.
Convert Time Between Any Two Timezones
Select timezones, enter date and time. DST is handled automatically using your browser’s IANA timezone database.
Select up to 6 cities. Green = business hours, orange = early/late, red = night. The grid shows 24 hours starting from the time you entered in the converter above.
UTC offset quick reference
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UTC Explained — The World’s Time Standard
UTC (Coordinated Universal Time) is the global time standard used to regulate the world’s clocks and time. Every time zone on Earth is defined as an offset from UTC — either ahead (UTC+) or behind (UTC-). Unlike local time, UTC never changes for DST and provides a universal reference point that works across all regions, technologies, and international systems. It replaced GMT (Greenwich Mean Time) as the global standard in 1972 and is maintained by atomic clocks that are accurate to within fractions of a nanosecond.
UTC vs GMT — are they the same?
In everyday use, UTC and GMT show the same time and the terms are used interchangeably. The technical distinction: GMT is based on astronomical observations of the Sun’s position over the Greenwich meridian. UTC is based on atomic clocks with occasional leap second adjustments to stay within 0.9 seconds of GMT. For all practical purposes of timezone conversion, they are equivalent. When you see UTC+0, GMT+0, or simply Z (Zulu time in aviation), they all refer to the same moment in time.
Why all systems use UTC internally
Date.now(), Python’s time.time(), and C’s time() all return Unix timestamps in UTC.Complete UTC Offset Reference — All Major Timezones
Standard time offsets (without DST). Many regions shift by +1 hour during summer DST periods.
| UTC Offset | Standard abbr. | Cities / Regions | DST? |
|---|---|---|---|
| UTC−12:00 | IDLW | Baker Island, Howland Island | No |
| UTC−10:00 | HST | Hawaii, French Polynesia | No |
| UTC−9:00 | AKST | Alaska | Yes (+1 AKDT) |
| UTC−8:00 | PST | Los Angeles, San Francisco, Vancouver, Seattle | Yes (+1 PDT) |
| UTC−7:00 | MST | Denver, Phoenix (AZ no DST), Calgary | Most yes (+1 MDT) |
| UTC−6:00 | CST | Chicago, Dallas, Mexico City, Winnipeg | US/Canada yes (+1 CDT) |
| UTC−5:00 | EST | New York, Toronto, Miami, Bogota, Lima | US/Canada yes (+1 EDT) |
| UTC−4:00 | AST | Halifax, Puerto Rico, Caracas | Partial |
| UTC−3:00 | BRT | Sao Paulo, Buenos Aires, Montevideo | Brazil partial |
| UTC+0:00 | GMT/WET | London, Dublin, Lisbon, Reykjavik, Accra | UK/Ireland yes (+1 BST/IST) |
| UTC+1:00 | CET/WAT | Paris, Berlin, Rome, Madrid, Lagos, Kinshasa | Europe yes (+1 CEST) |
| UTC+2:00 | EET/SAST | Cairo, Istanbul (now UTC+3), Johannesburg, Athens | Some (+1 EEST) |
| UTC+3:00 | MSK/EAT | Moscow, Istanbul, Nairobi, Riyadh | No |
| UTC+4:00 | GST/AZT | Dubai, Abu Dhabi, Baku | No |
| UTC+4:30 | IRDT | Tehran (with DST in summer) | Yes |
| UTC+5:00 | PKT | Karachi, Islamabad, Tashkent | No |
| UTC+5:30 | IST | Mumbai, Delhi, Kolkata, Chennai, Colombo | No |
| UTC+5:45 | NPT | Kathmandu (Nepal) | No |
| UTC+6:00 | BST/OMST | Dhaka, Almaty | No |
| UTC+6:30 | MMT | Yangon, Myanmar | No |
| UTC+7:00 | ICT/WIB | Bangkok, Ho Chi Minh City, Jakarta | No |
| UTC+8:00 | CST/SGT/HKT | Beijing, Shanghai, Singapore, Hong Kong, Taipei, Perth | No |
| UTC+9:00 | JST/KST | Tokyo, Seoul, Pyongyang | No |
| UTC+9:30 | ACST | Adelaide, Darwin | SA yes (+1 ACDT) |
| UTC+10:00 | AEST/VLAT | Sydney, Melbourne, Brisbane, Port Moresby | NSW/Vic yes (+1 AEDT) |
| UTC+12:00 | NZST/FJT | Auckland, Wellington, Fiji | NZ yes (+1 NZDT) |
| UTC+14:00 | LINT | Line Islands, Kiribati | No |
Daylight Saving Time (DST) — How It Affects UTC Conversions
Daylight Saving Time is the most common source of confusion in timezone conversion. This converter handles it automatically using the IANA timezone database — but understanding why it matters helps you avoid scheduling mistakes.
DST rules by region
| Region | DST period | Transition | Offset change |
|---|---|---|---|
| USA & Canada | 2nd Sun Mar → 1st Sun Nov | 2:00 AM local | +1 hour (spring forward) |
| European Union | Last Sun Mar → Last Sun Oct | 1:00 AM UTC | +1 hour |
| United Kingdom | Last Sun Mar → Last Sun Oct | 1:00 AM UTC | GMT+0 → BST+1 |
| Australia (SE) | 1st Sun Oct → 1st Sun Apr | 2:00 AM local | +1 hour (reversed seasons) |
| New Zealand | Last Sun Sep → 1st Sun Apr | 2:00 AM local | +1 hour |
| Brazil (SE) | Varies (suspended 2019) | — | BRT−3 only now |
| India, China, Japan | No DST | — | Fixed offset year-round |
| Arizona (USA) | No DST (exception) | — | MST−7 year-round |
The ambiguous hour problem
When clocks fall back (autumn, most regions 2:00 AM → 1:00 AM), there are two instances of every time between 1:00 and 2:00 AM — one in summer time and one in standard time. A meeting at "1:30 AM" on DST changeover night is ambiguous. When clocks spring forward, times between 2:00 and 3:00 AM do not exist at all. Systems dealing with scheduling across DST boundaries should store and transmit times in UTC to avoid these issues entirely.
Why DST affects UTC differently in the Americas vs Europe
The USA and Europe switch DST on different dates, creating a 2–3 week period each spring and autumn where the offset between US and European cities is 1 hour different from its usual value. For example, during the March window between US and EU switch dates, the New York–London time difference changes from its usual 5 hours to 6 hours. This period catches many international meeting schedulers by surprise.
UTC to EST, PST, IST, CST — The Most Searched Conversions
UTC to EST / EDT (New York, Eastern USA)
| UTC | EST (UTC-5, winter) | EDT (UTC-4, summer) |
|---|---|---|
| 00:00 UTC | 19:00 EST (prev day) | 20:00 EDT (prev day) |
| 05:00 UTC | 00:00 EST midnight | 01:00 EDT |
| 09:00 UTC | 04:00 EST | 05:00 EDT |
| 12:00 UTC | 07:00 EST | 08:00 EDT |
| 14:00 UTC | 09:00 EST | 10:00 EDT |
| 17:00 UTC | 12:00 EST noon | 13:00 EDT |
| 20:00 UTC | 15:00 EST | 16:00 EDT |
| 23:00 UTC | 18:00 EST | 19:00 EDT |
UTC to PST / PDT (Los Angeles, Pacific USA)
| UTC | PST (UTC-8, winter) | PDT (UTC-7, summer) |
|---|---|---|
| 08:00 UTC | 00:00 PST midnight | 01:00 PDT |
| 12:00 UTC | 04:00 PST | 05:00 PDT |
| 17:00 UTC | 09:00 PST | 10:00 PDT |
| 20:00 UTC | 12:00 PST noon | 13:00 PDT |
| 24:00 UTC | 16:00 PST | 17:00 PDT |
UTC to IST (India, UTC+5:30)
India does not observe DST. The offset is always UTC+5:30. Add 5 hours 30 minutes to UTC. Examples: 00:00 UTC = 05:30 IST, 06:30 UTC = 12:00 IST noon, 12:00 UTC = 17:30 IST, 18:30 UTC = 00:00 IST midnight (next day).
UTC to CET / CEST (Paris, Berlin, Rome)
CET (winter) = UTC+1, add 1 hour. CEST (summer) = UTC+2, add 2 hours. Europe switches last Sunday in March and last Sunday in October. Examples (CET winter): 09:00 UTC = 10:00 CET, 17:00 UTC = 18:00 CET. Same times in CEST (summer): 09:00 UTC = 11:00 CEST, 17:00 UTC = 19:00 CEST.
Scheduling Across Time Zones — Finding the Overlap Window
Finding a meeting time that works across multiple regions requires knowing which hours overlap as business hours. Use the meeting planner above for any combination. These are the classic difficult pairs:
The global meeting sweet spot
When teams span multiple continents, 8–9 AM UTC often works: New York is 3–4 AM (too early), London is 8–9 AM, Paris/Berlin is 9–10 AM, Dubai is 12–1 PM, Mumbai is 1:30–2:30 PM, Singapore is 4–5 PM. For purely Asia-Pacific+Europe overlap, 8–10 AM Central European Time works for Europe and starts early but is workable for Singapore (3–5 PM). Use the meeting planner grid above to find the green zone for your specific team.
LazyTools vs Other UTC Converters
| Feature | LazyTools | timeanddate.com | time.now | WorldTimeBuddy |
|---|---|---|---|---|
| Live world clock | ✅ 10 cities, 1-sec update | ✅ Yes | ✅ Yes | ✅ Yes |
| Meeting planner grid | ✅ 6 zones, color-coded | ✅ Yes | ❌ No | ✅ Yes (premium) |
| Unix timestamp converter | ✅ Any timezone | ⚠ Basic | ❌ No | ❌ No |
| ISO 8601 formatter | ✅ Auto-generated | ❌ No | ❌ No | ❌ No |
| DST-aware conversion | ✅ Automatic (IANA) | ✅ Yes | ✅ Yes | ✅ Yes |
| 40+ IANA timezones | ✅ Yes | ✅ 400+ | ⚠ City pairs | ✅ Yes |
| No account required | ✅ Yes | ✅ Yes | ✅ Yes | ⚠ Partial |
| No ads | ✅ AdSense only | ❌ Heavy ads | ❌ Ads | ❌ Heavy ads |
UTC & Timezone Converter FAQ
Subtract 5 hours (EST, winter) or 4 hours (EDT, summer). 15:00 UTC = 10:00 EST. The converter above handles the DST switch automatically.
Add 8 hours (PST, winter) or 7 hours (PDT, summer). 09:00 PST = 17:00 UTC. 09:00 PDT = 16:00 UTC.
Add 5 hours 30 minutes. India has no DST so this is constant year-round. 12:00 UTC = 17:30 IST. 18:30 UTC = 00:00 IST (midnight next day).
UTC (Coordinated Universal Time) is the global time standard. All world timezones are offsets from UTC. UTC never changes for DST. It is maintained by atomic clocks and is the successor to GMT. In practice, UTC = GMT for everyday conversions.
For everyday use, GMT and UTC show the same time. Technically, GMT is based on astronomical observations; UTC is based on atomic clocks. UTC is the official modern standard. Both are UTC+0 and never observe DST.
Subtract 6 hours (CST, winter) or 5 hours (CDT, summer). 18:00 UTC = 12:00 CST. Chicago and Dallas observe DST. Mexico City uses CST (UTC-6) year-round without DST.
DST moves clocks forward 1 hour in spring and back in autumn in participating regions. This changes the UTC offset: EST (UTC-5) becomes EDT (UTC-4). Not all regions use DST: India, China, Japan, most of Africa have fixed offsets. The converter handles DST automatically.
Add your UTC offset to UTC time. New York (EST): subtract 5 hours. London (GMT): same. Paris (CET): add 1 hour. India (IST): add 5:30. Select your city in the converter above for automatic DST-correct conversion.
Add 5 hours to current UTC. UTC+5 is used by Pakistan (PKT), Uzbekistan, and parts of Kazakhstan. Note: India is UTC+5:30, not UTC+5. The world clock above shows current times in major cities.
Add 5 hours (EST, winter) or 4 hours (EDT, summer). 10:00 EST = 15:00 UTC. 10:00 EDT = 14:00 UTC. Select America/New_York as the source and UTC as destination in the converter above.
Select source timezone, enter date and time, select destination. DST is handled automatically. Also includes: live world clock, meeting planner grid, Unix timestamp converter. Free, no account required.
Add 1 hour (CET, winter) or 2 hours (CEST, summer). 14:00 UTC = 15:00 CET = 16:00 CEST. Europe switches last Sunday in March and last Sunday in October.
Seconds since January 1, 1970, 00:00:00 UTC. Timezone-independent. 1700000000 = Nov 14, 2023, 22:13:20 UTC. Convert any Unix timestamp to human-readable time in any timezone using the converter above.
Add 10 hours (AEST, winter) or 11 hours (AEDT, summer). Australia’s DST runs Oct–Apr (reversed seasons). 08:00 UTC = 18:00 AEST = 19:00 AEDT. Brisbane does not observe DST (stays UTC+10).
Use the meeting planner grid above: select up to 6 cities, enter your proposed time. Green = business hours, orange = early/late, red = night. Find a slot that is green/orange for all participants. New York + London: 9 AM–12 PM ET. New York + India: 8–9 AM ET / 6:30–7:30 PM IST.
International standard: YYYY-MM-DDTHH:MM:SS+HH:MM. Example: 2024-03-15T14:30:00+05:30 = March 15, 2024, 2:30 PM in India. Z suffix means UTC. Used in APIs, databases, and international data exchange. The converter generates the correct ISO 8601 string automatically.