Date & Time
Time Zone Converter
Time Zone: time Zone Converter converts a wall-clock time from one IANA time zone to another, applying each zone's UTC offset and any daylight-saving adjustment in force on that date. Worked through below with real figures, and the calculator repeats the working on your own inputs — free, on-device, instant.
Time Zone Converter turns your date & time, from timezone and to timezone into the matching local time in each zone using IANA time-zone offsets with daylight saving. The maths runs locally, so nothing you enter leaves the page.
About this calculator
Time Zone is easiest to get wrong in the setup, not the arithmetic. Time Zone Converter converts a wall-clock time from one IANA time zone to another, applying each zone's UTC offset and any daylight-saving adjustment in force on that date. It matters whenever spans between dates, times or zones drive a plan, a deadline or a record. The worked example on this page (14:00 in New York (UTC−5) is 14:00 + 10.5 h = 00:30 next day in India (UTC+5:30).) shows the full substitution; the calculator above runs the same working on your own numbers, in your browser, with nothing uploaded.
How to use
- Enter the date and time as YYYY-MM-DD HH:MM.
- Choose the From time zone.
- Choose the To time zone.
- Press Calculate to see the converted time and UTC.
Why use Time Zone Converter
Fast
Calculations run in your browser. No round trip to a server.
Private
Your inputs never leave your device. Nothing is uploaded.
Free
No signup, no paywall, no ads-in-results, no watermarks.
Accurate
Uses standard calendar arithmetic where applicable. Check critical schedules, payroll, and official holiday dates before relying on results.
Mobile-ready
Optimised for phones, tablets, and desktops alike.
Transparent
Honest disclaimers wherever browser limits or regional rules apply.
Common uses
Use it for booking an international meeting
Use it when scheduling a call across time zones
Time Zone in support and on-call rotas
Use it for handling daylight-saving shifts
Use it when planning travel arrival times
Use it for webinar and stream timing
Technical notes
Time Zone Converter converts a wall-clock time from one IANA time zone to another, applying each zone's UTC offset and any daylight-saving adjustment in force on that date.
Calculations use the calendar only and do not adjust for time-zone shifts unless a field asks for a zone.
The tool works offline once loaded, since every computation is client-side.
FAQ
How is daylight saving handled?
Conversions use your browser's IANA time-zone data, which includes daylight-saving rules for the date you enter.
How is my input interpreted?
The date and time you type are read as wall-clock time in the From zone, then converted to the To zone.
What format should the date and time use?
Enter it as YYYY-MM-DD HH:MM in 24-hour form, for example 2024-01-01 12:00.
Does the Time Zone Converter send my data to a server?
No. The Time Zone Converter runs entirely in your browser — your inputs never leave your device, and nothing is uploaded or stored.
Worked example
14:00 in New York (UTC−5) is 14:00 + 10.5 h = 00:30 next day in India (UTC+5:30).