About this calculator
Enter a timestamp in seconds or milliseconds (detected automatically), or a date and time in IST to get the timestamp.
How to use it
- Choose the direction.
- Enter the timestamp, or the date and time in IST.
- Read the result.
The formula
Timestamp = seconds since 1970-01-01 00:00 UTC; IST = UTC + 5:30
- milliseconds
- numbers with 13 digits are read as milliseconds
Worked example
Timestamp 1790000000
- = 21 September 2026, 14:13:20 UTC.
- = 7:43 pm IST.
What the result means
Timestamps are the same everywhere; only the displayed local time changes.
Assumptions
- IST has no daylight saving.
Limitations
- Leap seconds are not counted, as in Unix time itself.
Frequently asked questions
What is epoch time?
Seconds since 00:00 UTC on 1 January 1970.
Is my timestamp in seconds or milliseconds?
Ten digits is usually seconds; thirteen is milliseconds.
How do I convert UTC to IST?
Add 5 hours 30 minutes.
Last reviewed on 3 October 2026. Found a mistake? Tell us.