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Unix Timestamp Converter
Convert Unix timestamps to readable dates and back. Auto-detects seconds, milliseconds, microseconds and nanoseconds. Includes a live clock button for the current time.
What the tool does
A Unix timestamp counts seconds since January 1, 1970 (the epoch). Paste one to see it as a UTC date, your local date and ISO 8601. Or pick a date to get its timestamp. The tool guesses the unit from the number of digits: 10 means seconds, 13 milliseconds, 16 microseconds, 19 nanoseconds.
Worked example
1700000000 is detected as seconds and converts to Tuesday, November 14, 2023 22:13:20 UTC. The same moment is 1700000000000 in milliseconds.
Why timestamps
APIs, databases and JWTs store time as plain numbers because they are timezone-free and easy to compare. This tool bridges those numbers and human dates.
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Frequently asked questions
What is a Unix timestamp?
The number of seconds since January 1, 1970 00:00:00 UTC, not counting leap seconds. It is the standard way computers store absolute time.
How do I know if my timestamp is seconds or milliseconds?
Count the digits: 10 digits is seconds, 13 is milliseconds. This tool detects it automatically and tells you which unit it found.
Why does the date look wrong?
Check the unit first. A millisecond value read as seconds lands in the year 50,000+. Also confirm whether you expected UTC or your local timezone.
What is the Year 2038 problem?
On systems storing timestamps in a signed 32-bit integer, time overflows on January 19, 2038. Modern 64-bit systems are unaffected.