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Unix Timestamp Converter

Convert Unix epoch time to date and back (IST/UTC).

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About Unix Timestamp Converter

Unix timestamps are a count of seconds since 1 January 1970 UTC, which is perfect for computers and useless to read. Paste one and get it back as IST, UTC, your own local time, ISO 8601 and a plain relative phrase like 3 days ago. Go the other way too, turning a date and time into seconds or milliseconds. Everything is calculated in your browser.

How to use Unix Timestamp Converter

  1. Read the live counter at the top for the current Unix time in seconds and the matching IST clock.
  2. Paste a timestamp into Timestamp to Date, or click Use now to drop in the current one.
  3. Check the detected unit line: values above about 1e11 are treated as milliseconds.
  4. Read the IST, UTC, local, ISO 8601 and relative rows below it.
  5. For the reverse, pick a date and time in Date to Timestamp, choose Local or UTC, and copy the seconds or milliseconds.

What people use it for

  • Working out what a created_at value in a database or API response means in IST
  • Checking whether a token or log entry is timestamped in seconds or milliseconds
  • Turning a deadline such as an exam or sale start time into an epoch value for code
  • Explaining to a teammate abroad which UTC moment your IST meeting time refers to

Good to know

IST is UTC plus 5 hours 30 minutes all year, with no daylight saving, which is why an IST date can be a day ahead of the UTC one for late-evening timestamps. Seconds and milliseconds are told apart by magnitude, so a very old millisecond value may be read as seconds. Your local time row follows your device's own time zone setting.

Frequently asked questions

What is a Unix timestamp?
It is the number of seconds elapsed since 1 January 1970 at 00:00 UTC, known as the epoch. It has no time zone of its own, which is why the same number shows different clock times in IST and UTC.
Why is the IST date one day ahead of the UTC date?
IST runs 5 hours 30 minutes ahead of UTC, so anything after 18:30 UTC already falls on the next calendar day in India. Both rows describe the same instant.
Seconds or milliseconds, how does it know?
By size. A ten-digit value is read as seconds and a thirteen-digit one as milliseconds, and the detected unit is shown so you can check it against your source.
Does it handle daylight saving time?
India has none, so IST is constant. Your local time row uses your device's zone and its current daylight saving rules, which matters if you are outside India.