Convert any time between 20+ world time zones instantly. Enter a time, select your zones, and see the equivalent time everywhere in one click.
Time (HH:MM or H:MM AM/PM)
From timezone
To timezone
Result — all timezones (click to copy)
Picking the Right Zone
Check whether DST is active first
This converter uses fixed zone abbreviations (e.g. EST vs EDT) rather than a live calendar — confirm whether Daylight Saving Time is currently in effect for the zone you need before picking Standard or Daylight.
Zones with no DST are always safe
UTC, GMT, PKT, IST, GST, AST, most of Asia, and Arizona-style zones never change for DST — these are reliable picks year-round with no seasonal ambiguity.
For a specific future meeting, double-check in your calendar app
This tool is built for quick, lightweight time-of-day conversion. For scheduling a specific dated meeting where DST transitions could be a factor, confirm the final time in your calendar app once the invite is created.
How to Use the Timezone Converter
Enter your time — type the time you want to convert in HH:MM format.
Select source timezone — choose the timezone the time is currently in.
Select target timezone — choose the timezone you want to convert to.
Read the converted time — see the equivalent time in the target timezone.
Account for date changes — the converter shows if the converted time falls on the previous or next day, which matters for scheduling across the International Date Line.
🌍 DST warning: Daylight Saving Time changes happen on different dates in different countries — and some countries don't observe DST at all. A time difference that is 5 hours in winter may be 4 or 6 hours in spring/autumn during the transition period. Always verify current offset for important meetings during DST transition weeks.
Understanding Time Zones
🌐 UTC — The Reference
Coordinated Universal Time (UTC) is the global time standard — replaced GMT in 1972 but both terms are still used interchangeably in common usage (technically UTC is atomic-clock based, GMT is astronomical). All time zones are defined as UTC offsets: UTC+5 (Pakistan), UTC+5:30 (India), UTC+0 (UK in winter), UTC-5 (US Eastern in winter). UTC never observes DST.
☀️ Daylight Saving Time
Clocks advance 1 hour in spring ('spring forward') and return in autumn ('fall back') in many countries. Purpose: shift daylight to evening hours when people are active. US: second Sunday March to first Sunday November. EU: last Sunday March to last Sunday October. Some countries never observe DST: India, China, Japan, most of Africa. Russia abolished DST in 2014.
🗺️ Half and Quarter Hour Offsets
Most time zones are whole hours from UTC. Exceptions: India UTC+5:30, Nepal UTC+5:45, Iran UTC+3:30, Afghanistan UTC+4:30, Australia (South) UTC+9:30, New Zealand's Chatham Islands UTC+12:45. These unusual offsets require care in scheduling — a 'one hour' difference assumption fails for these zones.
📅 International Date Line
The 180° meridian in the Pacific Ocean where the date changes. Crossing westward: gain a day. Crossing eastward: lose a day. Not a straight line — it deviates to keep island nations in the same date zone. Flying from Los Angeles to Tokyo crosses the IDL — you arrive the next calendar day having 'lost' a day westward, regained when returning eastward.
🕐 Unix Timestamp
Unix timestamps store time as seconds since January 1, 1970, 00:00:00 UTC — completely timezone-independent. The same Unix timestamp represents the same moment everywhere. Timezone conversion is applied only when displaying to the user. This approach eliminates timezone bugs in databases — store UTC, display local. Converting between timezones: the Unix timestamp doesn't change, only the displayed representation changes.
🏢 Business Time Zone Management
Global businesses must manage overlapping business hours across time zones. UTC−5 to UTC+5:30 (New York to Mumbai): 10.5-hour difference — minimal overlap. New York 9 AM = Mumbai 7:30 PM — marginal for synchronous communication. Finding the 'golden hour' — when working hours overlap between regions — is critical for scheduling. Some companies use UTC internally for all timestamps and schedules to eliminate confusion.
Time Zones in Global Work and Travel
Remote work and distributed teams
Distributed teams across multiple time zones face scheduling challenges that compound with team size. Best practices: establish a 'core hours' window where all team members are available (typically 4 hours). Rotate meeting times rather than always disadvantaging the same timezone. Use UTC for all internal scheduling references. Record all synchronous meetings for asynchronous review. Document decisions in writing immediately after synchronous discussions. Tools like World Time Buddy, Every Time Zone, and Calendly with timezone detection automate the conversion and scheduling overhead.
Air travel and jet lag
Jet lag occurs when your circadian rhythm (internal clock) misaligns with local time after crossing time zones. Westward travel (gaining time) is easier than eastward travel (losing time) — our circadian rhythm naturally runs slightly longer than 24 hours, making it easier to stay up later than to sleep earlier. Recovery time: approximately 1 day per time zone crossed for full circadian adjustment. Strategies: adjust sleep schedule toward destination time before departure, seek morning light at destination (most powerful circadian reset signal), avoid alcohol and caffeine for 24 hours before and during flights.
Financial markets and time zones
Global financial markets operate in specific time windows that traders must track across time zones. NYSE: 9:30 AM–4 PM Eastern (14:30–21:00 UTC). London Stock Exchange: 8 AM–4:30 PM GMT (8:00–16:30 UTC). Tokyo Stock Exchange: 9 AM–3 PM JST (0:00–6:00 UTC). Forex market: 24/5 operation with overlapping sessions — the London-New York overlap (8 AM–12 PM Eastern / 13:00–17:00 UTC) is the most liquid period. For traders in Pakistan (UTC+5): London open = 1 PM PKT, New York open = 6 PM PKT.
🌍 Key UTC offsets for reference: UTC−8: Los Angeles (PST). UTC−5: New York (EST). UTC+0: London (GMT winter). UTC+1: Paris, Berlin (CET). UTC+3: Dubai, Moscow. UTC+4: Abu Dhabi. UTC+5: Karachi (PKT). UTC+5:30: Mumbai. UTC+8: Singapore, Beijing. UTC+9: Tokyo. UTC+10: Sydney (AEST). UTC+12: Auckland. Note: these are standard offsets — DST shifts apply in many regions seasonally.
Time Zone Conversion Formula
Target time = Source time + (Target UTC offset − Source UTC offset), carrying over to the next or previous day if the result crosses midnight.
Worked example
Converting 3:00 PM UTC to Pakistan Standard Time (UTC+5): offset difference = +5 − 0 = +5 hours. 3:00 PM + 5 hours = 8:00 PM PKT, same day. Converting 11:00 PM EST (UTC−5) to JST (UTC+9): offset difference = +9 − (−5) = +14 hours. 11:00 PM + 14 hours = 1:00 PM, rolling into the next day (+1 day) in JST.
Avoid These Mistakes
Picking Standard time during Daylight Saving season
EST and EDT (or CST/CDT, PST/PDT) are not interchangeable — using the wrong one for the current season produces a result that's off by exactly one hour.
Assuming "CST" always means the same zone
CST is used for both US Central Standard Time (UTC−6) and China Standard Time (UTC+8) — an 14-hour difference. Double-check which "CST" you actually mean.
Forgetting the date can change
A large offset difference can push the converted time into the next or previous day — always check the "+1 day"/"−1 day" marker in the result before confirming a meeting time.
Frequently Asked Questions
What is UTC?
UTC (Coordinated Universal Time) is the world's primary time standard. All other time zones are defined as offsets from UTC. It replaced GMT as the standard in 1967 and does not observe daylight saving time.
What is the difference between EST and EDT?
EST (Eastern Standard Time) is UTC−5, used in winter. EDT (Eastern Daylight Time) is UTC−4, used in summer when clocks are moved forward one hour. The US switches between them twice a year.
What time zone is Pakistan?
Pakistan uses PKT (Pakistan Standard Time) = UTC+5. Pakistan does not observe daylight saving time. When it's 12:00 noon UTC, it's 5:00 PM in Pakistan.
How do I schedule a meeting across time zones?
Enter the meeting time in your local timezone and check the result for all participants' timezones. Key Pakistan-friendly times: 9 AM PKT = 4 AM UTC = 12 AM EST = 11 AM IST. For US West Coast: 9 AM PST = 10 PM PKT (next day).
What is daylight saving time?
Daylight saving time (DST) moves clocks forward by 1 hour in spring and back in autumn to make better use of daylight. Not all countries observe DST — Pakistan, India, China, and Japan do not. The US, UK, and most of Europe do.
References
🌐 IANA Time Zone Database
The authoritative source for time zone and DST transition rules worldwide, used by browsers, operating systems, and most scheduling software.
📅 Your calendar app
For a dated meeting invite, your calendar software's own time zone handling (Google Calendar, Outlook) is the definitive source once the invite is created — use this tool for quick planning, then confirm in the actual invite.