Timestamp converter
Convert Unix timestamps to readable dates and back. Handles seconds and milliseconds, UTC and local time.
About this tool
Unix timestamps appear in every log, API response and database, but a number like 1768478400 means nothing until it becomes a date. This converter turns timestamps into readable UTC and local times, and converts dates back into timestamps, in either direction.
Seconds and milliseconds are handled explicitly or detected automatically by length — 10 digits are seconds, 13 are milliseconds — and dates before 1970 convert correctly as negative timestamps. Showing UTC and your browser’s local time side by side is what removes the classic timezone mistake when you are debugging across servers, teammates and regions.
How to use Timestamp converter
- Paste a Unix timestamp or a readable date.
- Timestamps auto-detect seconds vs milliseconds; you can also set the unit explicitly.
- Read the UTC and local results, or convert in the other direction.
Keep the original files and inspect the exported result before publishing or sharing it.
Frequently asked questions
How do I tell seconds from milliseconds?
Count the digits: 10 digits are seconds, 13 are milliseconds. Automatic mode uses that rule; choose the unit explicitly if your value is unusual.
Which timezone is “local time”?
Your browser’s timezone. UTC is shown alongside so results stay unambiguous.
Does it handle dates before 1970?
Yes. Negative timestamps (before 1970-01-01) convert correctly within the representable range.
What date formats are accepted?
Anything JavaScript parses reliably: YYYY-MM-DD, YYYY-MM-DD HH:MM, and full ISO 8601 strings.
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