How to Convert a Unix Timestamp to a Date
Short answer
Unix time counts seconds since 1970-01-01T00:00:00Z. Multiply by 1000 for JavaScript milliseconds. Example: 1700000000 β 2023-11-14T22:13:20Z.
Logs and APIs love epoch integers. Convert them with the Unix timestamp converter.
Seconds vs milliseconds
Values near 1.7e9 are seconds; near 1.7e12 are milliseconds.
Time zones
Epoch is UTC. Display local time in your browser zone, or compare cities with the time zone converter.
Negative timestamps
Dates before 1970 use negative values in many systems.
Open the free date difference calculator.
Related: how to convert time zones.
Related: what is a uuid.
Related: how to fix invalid json.
More practice
Change the inputs, rewrite the formula from memory, then confirm with the tool. Keep units consistent and read the disclaimer on tax or health pages before acting on a number.
Frequently asked questions
What is Unix time?
Seconds since the Unix epoch (1 Jan 1970 UTC).
Why is my timestamp huge?
It may be milliseconds β divide by 1000 for seconds.
Does it include leap seconds?
Most platforms ignore leap seconds in Unix time.
Can I convert a date back to epoch?
Yes β paste an ISO date into the converter.