A Unix timestamp converter translates between an integer count of seconds (or milliseconds) since the Unix epoch (January 1, 1970 UTC) and a human-readable date in any timezone. Paste a timestamp to see it in ISO 8601, RFC 2822, UTC, local time, and relative time, or pick a date to convert it back to seconds and milliseconds.
| Format | Example | Notes |
|---|---|---|
| Unix (seconds) | 1735689600 | 10-digit integer count of seconds since 1970-01-01 UTC. |
| Unix (milliseconds) | 1735689600000 | 13-digit JavaScript-style timestamp in milliseconds. |
| ISO 8601 | 2025-01-01T00:00:00.000Z | International standard. The Z suffix indicates UTC. |
| ISO 8601 with offset | 2024-12-31T19:00:00-05:00 | Same instant expressed with a timezone offset. |
| RFC 2822 | Wed, 01 Jan 2025 00:00:00 +0000 | Email and HTTP header style date string. |
| Local string | 1/1/2025, 12:00:00 AM | Browser-locale formatted date and time. |
| UTC string | Wed, 01 Jan 2025 00:00:00 GMT | toUTCString() output - always in UTC. |
| Relative | in 2 hours | Human-friendly distance from now. |
A Unix timestamp is the number of seconds that have elapsed since 00:00:00 UTC on January 1, 1970, also known as the Unix epoch. It is a single integer that represents an exact moment in time, independent of timezones or calendar formats.
Most Unix systems and many programming languages historically used seconds, while JavaScript and many newer APIs use milliseconds for higher precision. A 10-digit timestamp is almost always seconds, while a 13-digit timestamp is almost always milliseconds.
Epoch time is another name for Unix time. The Unix epoch is the reference point of January 1, 1970 at 00:00:00 UTC, and epoch time counts the seconds (or milliseconds) since that moment.
In JavaScript: new Date(unixSeconds * 1000). In Python: datetime.fromtimestamp(unixSeconds, tz=timezone.utc). In PostgreSQL: to_timestamp(unixSeconds). In MySQL: FROM_UNIXTIME(unixSeconds).
Yes. A Unix timestamp is an absolute count of seconds since the epoch and does not carry timezone information. Timezones only matter when you format the timestamp into a human-readable date.
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