Date Calculator
Calculate the number of days between two dates or add and subtract days, weeks, months, and years.
Local processingUnix Timestamp Converter
About this tool
Convert a Unix timestamp into a readable local or UTC date, or choose a date and create the corresponding timestamp. The tool can usually detect whether a value is in seconds or milliseconds and can process several values at once.
Features
- Convert seconds or milliseconds
- Show local time and UTC
- Display the current Unix timestamp
- Copy an ISO 8601 date
- Convert several timestamps at once
How to use
- Enter timestamp or date: Paste epoch numbers or pick a calendar datetime.
- Select units: Toggle seconds or milliseconds if auto-detection is ambiguous.
- Copy results: Use ISO or locale strings in queries and docs.
Examples
- Read timestamps found in an application log
- Convert stored database timestamps for a report
- Create a timestamp for testing an expiry time
- Compare timestamps produced by different systems
Limitations
- Very old or extremely distant dates may exceed the date range supported by the browser
- Daylight-saving changes follow the time-zone information available to the browser
- The entered data and timestamp conversions are processed directly in your browser and are not sent to a server.
FAQ
- How are seconds and milliseconds detected?
- Values with enough digits to represent current dates in milliseconds are treated as milliseconds. You can change the unit manually when necessary.
- Which timezone is shown?
- Local time uses your browser/OS timezone; UTC is always shown in parallel.
- Can I convert back to Unix?
- Yes. Pick a datetime to get epoch seconds and milliseconds.