Is my timestamp data sent to a server?
No. All conversions are performed directly in your browser. No account needed, no data leaves your device.
Free online • Instant conversion • Auto-detect format
Timestamp Conversion
Free online Unix timestamp converter. Convert between Unix seconds, milliseconds, ISO 8601 and RFC 2822.
Convert Unix timestamps to dates and back
This free online Unix timestamp converter instantly translates between epoch time and human-readable dates. Auto-detects seconds vs milliseconds, supports ISO 8601 and RFC 2822 output, and includes reverse conversion — instant, accurate conversions right in your browser.
Timestamp Converter FAQ
How does it detect seconds vs milliseconds?
The converter automatically detects the format based on the number of digits. Timestamps with more than 10 digits (greater than 9999999999) are treated as milliseconds; others as seconds.
What output formats are supported?
The converter outputs local time, UTC time, ISO 8601, RFC 2822, and a human-readable formatted date. Reverse conversion produces both Unix seconds and milliseconds.
What is a Unix timestamp (epoch time)?
A Unix timestamp is the number of seconds that have elapsed since January 1, 1970 at 00:00:00 UTC (the Unix epoch). It is a universal way to represent a specific point in time, independent of timezone.
Can I convert a date back to a Unix timestamp?
Yes. The reverse conversion section lets you select any date, time, and timezone, and instantly get the corresponding Unix timestamp in both seconds and milliseconds.