Unix Timestamp Converter

Unix Timestamp Converter turns the long numbers computers use for time, such as 1767225600, into a date you can read, and turns a date back into that number. A Unix timestamp counts the seconds since midnight UTC on 1 January 1970; many systems count milliseconds or even microseconds instead, so this tool looks at how many digits you pasted and works out the unit for you, telling you what it decided.

It is made for developers reading logs, database rows and API responses, and for anyone who has been sent a meeting time in someone else’s zone. One paste shows UTC, your own time, ISO 8601, RFC 2822, how long ago it was, and the same moment in a list of cities you choose. A live clock at the top shows the current epoch time ticking, ready to copy.

Time zones come from your browser’s own copy of the official zone database, so daylight saving is handled properly, including the hour that happens twice when clocks go back and the hour that never happens when they go forward. Everything is worked out on your device, and a batch mode converts thousands of lines at once.

1. Copy the current time from the live clock at the top, or press “Convert this” to load it into the converter.
2. In “Timestamp to date”, paste a timestamp or a date into the box. The line under it says how it was read, for example “Unix time in milliseconds (13 digits)”.
3. Read the results and press the copy button beside any line. If the guessed unit is wrong, choose it from the Unit list.
4. Use the “Add a zone” box to add cities to “Around the world”, or press × to remove one. Your list is remembered on this device.
5. To go the other way, choose “Date to timestamp”, pick a date, a time and a zone. For a long list, choose “Many at once”, paste one value per line, then press “Copy as CSV” or “Download CSV”.

• Live epoch clock in seconds and milliseconds, with copy buttons and a pause.
• Automatic unit detection: up to 11 digits are seconds, 12–14 milliseconds, 15–17 microseconds and 18–19 nanoseconds, with a manual override.
• Reads ISO 8601 dates (with Z, an offset like +05:30, or no zone), RFC 2822 and HTTP dates, negative timestamps before 1970 and decimal seconds.
• Shows UTC, your local time, ISO 8601 in UTC and with your offset, RFC 2822, relative time with the exact gap, day of the year and ISO week number.
• A list of world time zones you can edit, with a search that understands cities, countries, abbreviations such as AEDT and offsets such as +5:30.
• Date to timestamp in any zone, with a clear warning when a time is skipped or repeated by a daylight-saving change.
• Batch mode for up to 5,000 lines, with unreadable lines marked rather than silently dropped, and CSV copy or download.

• A 10-digit number is almost always seconds and a 13-digit number milliseconds. JavaScript’s Date.now() gives milliseconds; most databases and Unix tools give seconds.
• A date written without a zone, such as 2026-01-01 09:00, is read as UTC here, and the tool says so. Use “Date to timestamp” to read it as a particular city’s time.
• Leap seconds aren’t counted in Unix time, so every day is exactly 86,400 seconds. That is how computers do it too, so the results match your systems.
• Zone rules come from your browser, so keep it updated for the latest daylight-saving changes.