Time Zone Converter
Free Time zone Calculator for time zones. Enter your stats to get performance metrics and improvement targets. Get results you can export or share.
Reviewed for accuracy by Daniel Agrici, Founder & Lead Developer
Time Zone Converter
Calculator
Adjust values & calculateEnter your values below. Every result is computed in your browser — no data is sent to any server.
Formula: Target Time = Source Time + (To_Offset - From_Offset)
Worked example — 19:30 GMT
Formula
Target Time = Source Time + (To_Offset - From_Offset)
UTC offsets: EST=-5, CST=-6, PST=-8, GMT=0, CET=+1, IST=+5.5, JST=+9, AEST=+10.
Worked Examples
Example 1: NYC to London
Problem:14:30 EST (UTC-5) to GMT (UTC+0)
Solution:14:30 + 5 hours = 19:30
Result:19:30 GMT
Example 2: Crossing midnight into the next day
Problem:Convert 22:00 in Los Angeles (PST, UTC-8) to Tokyo (JST, UTC+9)
Solution:Offset difference = 9 - (-8) = 17 hours 22:00 + 17:00 = 39:00 → 39:00 - 24:00 = 15:00 the next day
Result:15:00 JST (next day)
Frequently Asked Questions
What about daylight saving time?
DST shifts the offset by +1 hour (e.g., EST=-5 becomes EDT=-4). Not all regions observe DST — Arizona, Hawaii, and most of Asia/Africa do not.
Which time zones use half-hour or quarter-hour offsets?
Several time zones use non-standard offsets. India Standard Time (IST) is UTC+5:30. Nepal is UTC+5:45. Iran is UTC+3:30 (standard) and UTC+4:30 (daylight). Australia has states spanning UTC+8, UTC+9:30, and UTC+10:30. These fractional offsets arose historically to balance geographic and political boundaries without adopting a neighboring country's full-hour time.
What is the International Date Line and how does it affect time conversions?
The International Date Line runs roughly along the 180° meridian in the Pacific Ocean. Crossing it eastward (traveling from Asia to Americas) moves you back one calendar day; crossing westward moves you forward one day. Time Zone Converter handles day changes automatically (showing 'next day' or 'previous day' in the output). Kiribati, Samoa, and Tonga are examples of nations near the date line that have shifted to the western side for economic alignment with Asia-Pacific partners.
How should I handle scheduling across multiple time zones for a meeting?
Choose a time that falls within business hours (9am-5pm) for all participants where possible. Tools like World Time Buddy or Time Zone Converter can help identify overlap windows. For globally distributed teams, rotating meeting times so the inconvenient hour is shared fairly shows consideration. Always confirm the time zone in the meeting invitation using both the local time AND the UTC offset to prevent ambiguity during DST transitions.
What UTC offset should I enter for a specific abbreviation like EST or CET?
Common standard-time offsets are EST=-5, CST=-6, MST=-7, PST=-8, GMT/UTC=0, CET=+1, EET=+2, MSK=+3, GST(Dubai)=+4, IST(India)=+5.5, ICT(Bangkok)=+7, SGT/CST(China)=+8, JST(Japan)=+9, AEST(Sydney standard)=+10. During daylight saving time, add 1 hour to zones that observe it (e.g., EST becomes EDT at -4, CET becomes CEST at +2). Always double-check whether the date you're converting for falls inside the DST window for both locations.
Does Time Zone Converter account for daylight saving time automatically?
No — because DST start and end dates vary by country and change some years by legislation, Time Zone Converter asks you to enter the UTC offset directly rather than a named zone, so you retain full control. If either location observes DST on the date you're converting for, add 1 to that location's standard offset before entering it (e.g., use -4 instead of -5 for US Eastern in summer). This avoids the common error of using a named zone abbreviation that silently shifts meaning twice a year.
References
Reviewed for accuracy by Daniel Agrici, Founder & Lead Developer · Editorial policy
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