Tools
Timestamp and time zone converter
Convert timestamps into readable dates, add or subtract time and compare time zones.
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About this tool
This tool brings together three everyday date chores: turning a timestamp from a log file or database into a readable date, checking what time it is right now in New York, London or Tokyo before you book a call, and working out which day falls 45 days from now or 12 hours ago. It is just as handy for developers as for anyone coordinating a team across countries.
On the Convert tab, type into any of the four rows (Unix seconds, Unix milliseconds, ISO 8601 or date and time) and the others fill in automatically; “Use current time” loads the present moment. On Time zones, add up to six cities from the drop-down to see their live time and offset from UTC. On Date maths, enter a starting date, choose add or subtract, then set the amount and unit.
Everything is calculated in your browser using your own system’s time zone data, so nothing is sent anywhere. The “Date and time” row is read in your device’s time zone, whereas ISO 8601 is shown in UTC. For date maths, a month counts as exactly 30 days, so double-check results when adding calendar months. Dates before the common era and non-Gregorian calendars are not supported.
Frequently asked questions
How do I find the time difference between two countries?
Add both cities on the Time zones tab. Each one shows its offset from UTC next to the name, already adjusted for any daylight saving time in force there.
Does it account for daylight saving time?
Yes. Each city’s time comes from your browser’s time zone database, which includes the summer and winter clock changes for every country.
What is the ISO 8601 format?
It is the international standard for writing dates, such as 2024-01-01T00:00:00.000Z: year, month and day from largest to smallest, the time after the T, and a trailing Z meaning UTC. Most APIs and databases use it.
How do I work out the date 90 days from today?
Open Date maths, press Now to use the current moment, leave Add selected, type 90 and choose Days. The result appears in UTC, as a Unix timestamp and as relative time.