Unix Timestamp Converter
Local processing · never uploadedConvert Unix timestamps to human dates and back — seconds, milliseconds, UTC & local.
Enter a timestamp or date — or click Now.
What is Unix Timestamp Converter?
Unix Timestamp Converter turns an epoch timestamp into a human-readable date — and a date back into a timestamp — instantly, with seconds and milliseconds support.
A Unix timestamp (also called epoch time) is the number of seconds that have elapsed since 00:00:00 UTC on 1 January 1970. It is the most common way computers store and exchange a moment in time because it is compact, unambiguous and timezone-independent. Logs, databases, APIs and JWTs all use it. The catch is that a number like 1700000000 means nothing to a human — you need a converter.
Paste a timestamp and this tool shows it as ISO 8601, a UTC string, your local time, and a relative description such as "2 hours ago". It auto-detects whether your number is in seconds (10 digits) or milliseconds (13 digits). You can also type a date string to get the timestamp back, or hit "Now" to grab the current epoch time for testing.
Everything is computed in your browser. Local time and relative values use your own device clock and timezone, and nothing is sent to a server.
FAQ
Seconds or milliseconds — how does it know?
It auto-detects by magnitude: 10-digit values are treated as seconds and 13-digit values as milliseconds. Both unix (seconds) and unix (milliseconds) are always shown in the output.
What is the difference between UTC and local time?
UTC is the global reference time with no offset. Local time applies your device’s timezone, so the two differ by your UTC offset (for example +8 hours in China).
Can I convert a date back into a timestamp?
Yes. Type a date string (for example 2026-06-13 or an ISO date) and the tool returns the matching Unix timestamp in seconds and milliseconds.
What does the "Now" button do?
It fills the input with the current epoch time, which is handy when you need a fresh timestamp for testing or debugging.