Productivity Tools
Time Zone Calculator
Convert time between different time zones. Calculate time differences and schedule across global time zones.
Use Time Zone Calculator to get instant results without uploads or sign-ups. Everything runs securely in your browser for fast, reliable output.
Your results will appear here.
About this tool
Time zone conversion is essential for global communication. Our Time Zone Calculator converts times between any two time zones, accounting for the time difference.
Use for scheduling international meetings, planning travel, coordinating with remote teams, and understanding time differences. Supports major time zones worldwide.
Usage examples
US to UK Meeting
Convert EST to GMT
3:00 PM EST = 8:00 PM GMT (5 hours ahead)
US to Asia Call
Convert PST to JST
9:00 AM PST = 2:00 AM JST next day (17 hours ahead)
How to use
- Optional: Select a Popular Zone preset (EST/EDT, PST/PDT, GMT, CST, JST, AEST)
- Enter a time in "From Time Zone".
- Select "From Time Zone" (e.g., EST, PST).
- Select "To Time Zone" for conversion.
- Click "Calculate" to see converted time.
- View quick comparison of current time in 5 major cities
- Each output has its own Copy button for easy sharing
Benefits
- Convert any time zone
- Calculate time differences
- Schedule international meetings
- Plan travel itineraries
- Coordinate global teams
- Avoid scheduling conflicts
FAQs
What time zone abbreviations mean?
Common abbreviations: EST (Eastern Standard Time, UTC-5), PST (Pacific Standard Time, UTC-8), GMT (Greenwich Mean Time, UTC+0), JST (Japan Standard Time, UTC+9), AEST (Australian Eastern Standard Time, UTC+10). "Standard" = winter, "Daylight" = summer (EDT, PDT).
How do I calculate time zone difference?
Subtract source offset from destination offset. Example: London (UTC+0) to New York (UTC-5) = -5 difference. When it's noon in London, it's 7 AM in New York. Moving east adds hours, moving west subtracts hours.
Why do some time zones have half-hour offsets?
Some regions use 30 or 45-minute offsets for geographic/political reasons. Examples: India (UTC+5:30), Nepal (UTC+5:45), Newfoundland (UTC-3:30). These create scheduling challenges but align better with solar noon in those locations.
What is Daylight Saving Time and how does it affect time zone calculations?
Daylight Saving Time (DST) shifts clocks forward 1 hour in spring and back 1 hour in fall to extend evening daylight. US observes DST from 2nd Sunday in March to 1st Sunday in November (EDT, PDT instead of EST, PST). Europe changes last Sunday of March/October. Not all countries observe DST - Arizona, Hawaii don't. When DST is active, time difference changes by 1 hour. Always check current DST status for accurate conversions.
What is the best time to schedule international meetings?
Find overlapping work hours (9 AM-5 PM local). For US-Europe: 9-11 AM ET (2-4 PM London). For US-Asia: 6-8 PM PT (9-11 AM Tokyo next day). Use World Time Buddy or when2meet to visualize overlaps. Rotate times to share inconvenience.
How do airlines handle time zone changes?
Airlines always display local times: departure in origin timezone, arrival in destination timezone. "Flight time" is actual time in air. For connections, layover time accounts for timezone changes. Always check if arrival is same day or next day.
Related tools
View all toolsCalendar Generator
Generate printable calendars for any month and year. Create custom monthly calendars with holidays and important dates.
Productivity ToolsCountdown Timer Maker
Calculate countdown timer duration to any date and time. Create countdowns for events, launches, and deadlines.
Productivity ToolsDays Between Dates Calculator
Calculate days, weeks, months, and years between two dates. Perfect for project planning, age calculation, deadline tracking, and event countdowns.
Productivity Tools