Timestamp Converter: Unix Timestamp to Date and Back

A Unix timestamp counts the seconds that have passed since the first moment of 1 January 1970 in UTC. Databases, log files and APIs store time this way because a single integer is unambiguous, sorts correctly and carries no timezone confusion. The cost is that a raw timestamp means nothing to a human reading it.

This converter works in both directions. Paste a timestamp to see it as a readable date in your local timezone and in UTC, alongside the ISO 8601 form that most APIs expect. Or pick a date and time to get the matching timestamp in both seconds and milliseconds.

The tool detects automatically whether a pasted number is in seconds or milliseconds, which removes the most common source of error: a value that is a thousand times too large lands in the year 56000 rather than next Tuesday. It also shows how long ago or how far ahead the moment is, which is often the thing you actually wanted to know.

• Automatic detection of seconds versus milliseconds
• Local time, UTC and ISO 8601 output
• Relative description such as three hours ago
• Date to timestamp in both seconds and milliseconds
• Day of the week and day of the year
• Copy any individual result
• Uses your device clock and timezone

The timestamp converter is used by writers, developers, students, marketers and anyone else who needs the job done once without installing software. Common cases include:

• Reading timestamps in server logs and error reports
• Checking when a token or cache entry expires
• Converting a date into the format an API expects
• Debugging timezone differences between systems
• Working out how old a database record is