Unix Timestamp Converter
Convert Unix seconds or milliseconds to UTC and local dates, or convert ISO dates with an explicit offset to Unix time.
Drop your file hereTap to choose a file
or click to browse, or paste from the clipboard
Choose seconds or milliseconds
Set the units explicitly to distinguish Unix seconds from millisecond timestamps. Negative values work for dates before 1970.
Check dates across time zones
See UTC and local time together. Enter an ISO date with Z or a numeric offset to convert back to the Unix epoch.
Export a batch
Paste up to 2,000 lines. Copy the results to a spreadsheet or download the CSV, including line numbers and any validation errors.
How to use Unix Timestamp Converter
- 1
Choose Unix seconds, Unix milliseconds, or an ISO date with a time zone.
- 2
Paste one value per line, or use the current time as an example.
- 3
Convert, review any errors by line, then copy or download the table.
What people use this tool for
- Inspect timestamps from application logs.
- Convert a list of event dates for a spreadsheet.
Frequently Asked Questions
Which units should I select?
Select the units used by your source. For example, 1700000000 seconds and 1700000000000 milliseconds refer to the same instant.
How are time zones handled?
Dates display in UTC and in your browser’s local time zone. When entering dates, specify Z or a numeric offset so the result is unambiguous.
Are dates before 1970 supported?
Yes. Negative Unix values represent instants before 1970-01-01T00:00:00Z.