Unix Timestamp Converter
Switch between epoch time and UTC dates.
How to use Unix Timestamp Converter
Convert Unix seconds or milliseconds explicitly. For date input, use an ISO 8601 date with a time zone, such as 2023-11-14T22:13:20Z.
Good to know
Unix time counts from January 1, 1970 UTC. Results include UTC and your local time. Explicit units avoid confusing seconds with milliseconds.
Recognize seconds versus milliseconds
Choose Seconds to date to try this example.
Input
1700000000
Expected result
UTC: 2023-11-14T22:13:20.000Z Seconds: 1700000000 Milliseconds: 1700000000000
Common questions and mistakes
Why does my date appear in 1970?
You may have interpreted seconds as milliseconds. A modern Unix timestamp in seconds often has ten digits; milliseconds often has thirteen. That is a useful clue, not a universal validation rule. Choose the unit from the system that produced the value.
How do I avoid time-zone ambiguity?
For Date to timestamp, include Z for UTC or an explicit offset, such as 2023-11-15T03:43:20+05:30. These represent the same instant as the example. The local result depends on your device’s time zone.
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