Timezone Converter
Numbers & DatesConvert Unix timestamps and ISO dates across 130+ world cities. Compare times in multiple timezones side by side, search by city or country, add custom IANA timezones, and pick any date with the built-in calendar.
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About Timezone Converter
A world clock and timezone converter combined. Enter a Unix timestamp or ISO date string, or pick any moment with the built-in calendar, and instantly see the corresponding local time across 130+ cities worldwide. Search by city, country or IANA timezone identifier, add any custom timezone, and compare UTC offsets and relative time differences at a glance.
Features
- ✓130+ cities across every major timezone, searchable by name, country or IANA id
- ✓Custom IANA timezone support — type any tz string (e.g. Pacific/Marquesas) to add it
- ✓Built-in calendar popover with time picker — click the input to open
- ✓Unix timestamp (seconds/ms) and ISO date string input modes
- ✓Selecting a city auto-adds all cities in the same country
- ✓UTC offset (UTC+05:30) and relative local offset (+2h / -3h) per city card
- ✓DST transitions handled automatically via IANA timezone database
Common Use Cases
- Schedule international meetings by checking what time it is in each attendee's city
- Decode a Unix timestamp from an API or log and see the equivalent time in multiple cities
- Plan travel across timezones by entering an arrival date and comparing local times
- Verify DST transition times for a specific future date
- Convert a Unix epoch to readable time in 10 different cities simultaneously
Frequently Asked Questions
QWhat is a Unix timestamp?
A Unix timestamp is the number of seconds elapsed since 00:00:00 UTC on January 1, 1970 (the Unix epoch). It uniquely identifies a moment in time independent of timezone. This tool accepts both second-precision (10 digits) and millisecond-precision (13 digits) variants.
QHow are daylight saving time (DST) changes handled?
DST is handled automatically. All timezone conversions use the IANA timezone database via the browser's Intl API, which includes historical and future DST rules for every region.
QCan I add a timezone that isn't in the city list?
Yes. Type a valid IANA timezone identifier (e.g. America/Indiana/Indianapolis or Pacific/Marquesas) in the search box. The tool will validate it and offer an "Add custom timezone" option.
QWhat does the relative offset mean on each city card?
The relative offset (e.g. +2h or -3h 30m) shows how far ahead or behind that city is compared to your current local timezone, making it easy to mentally calculate meeting times.