Unix Timestamp Converter
Convert Unix timestamps to human-readable dates and back again, with UTC, local, and ISO 8601 views of the same moment. Debugging time-sensitive data becomes a two-second job.
Step-by-step guide to the Timestamp Converter
- Paste a Unix timestamp in seconds and click to convert it into a date.
- Or enter a date and time and convert it into a timestamp.
- Compare the UTC, local, and ISO representations side by side.
- Copy whichever format your system or database expects.
Practical scenarios for the Timestamp Converter
- Reading exp and iat claims while debugging authentication tokens.
- Interpreting log lines that only record epoch seconds.
- Checking whether a stored timestamp matches an expected calendar date across timezones.
- Generating timestamps for API requests or database seeds.
How the Timestamp Converter works under the hood
The converter uses your device clock and timezone rules to render local time, while UTC output remains fixed regardless of where you are, which is why both are shown together. ISO 8601 output includes timezone offset information so the moment stays unambiguous when shared. All conversion logic is native browser date handling, so no timestamp you paste is sent anywhere.
What the Timestamp Converter does not do
Timestamps in milliseconds rather than seconds are a common mix-up; if a date looks absurdly far in the future, your input may be in milliseconds.
Common questions about the Timestamp Converter
What is the difference between seconds and milliseconds?
Unix time traditionally counts seconds; JavaScript uses milliseconds. Divide by 1000 to switch between them.
Why do UTC and local differ?
Your local zone offsets from UTC by your timezone; the underlying moment is identical.
Can I convert dates before 1970?
Yes, negative timestamps represent moments before the Unix epoch.
Last reviewed: October 2026.