Unix Timestamp Converter: Epoch Time to Date and Back

Choose a direction. Enter a Unix timestamp to see the date in UTC and Indian time, or enter a UTC date and time to get the timestamp in seconds and milliseconds.

FreeNo sign-upRuns in your browserUpdated 2 Nov 2026
Seconds or milliseconds. 13 digits are read as milliseconds.
Your resultLive

Estimates only. Check important results before you rely on them.

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How to use this calculator

  1. Choose Timestamp to date or Date to timestamp.
  2. Enter the timestamp, or the UTC date and time.
  3. Read the result in seconds, milliseconds, UTC and IST.
  4. Copy the ISO 8601 value if you need it for code.

The formula

Unix time is the number of seconds since 1 January 1970 00:00:00 UTC. A value of 1,000,000,000,000 or more is read as milliseconds. Date = 1970-01-01 + seconds.

Worked example

The timestamp 1700000000 is Tuesday, 14 November 2023, 22:13:20 UTC, which is 3:43:20 am IST on 15 November. The date 2 November 2026 12:00 UTC is the timestamp 1793620800.

Understanding your result

Timestamps ignore time zones, so the same number means the same instant everywhere. Only the displayed date changes by zone.

When to use it

  • Debug logs and databases.
  • Convert API timestamps to readable dates.
  • Create timestamps for code and scheduling.

Assumptions and limits

Dates for conversion are taken as UTC. Leap seconds are not counted, as is standard for Unix time.

Frequently asked questions

What is a Unix timestamp?

The number of seconds since 1 January 1970 UTC.

How do I tell seconds from milliseconds?

Seconds are 10 digits for current dates and milliseconds are 13 digits.

What is the Unix epoch?

1 January 1970 00:00:00 UTC.

Does a timestamp have a time zone?

No. It marks one exact instant, and you choose a zone to display it.

What happens in 2038?

Systems storing it in 32 bits overflow in January 2038. Modern systems use 64 bits.