Unix Timestamp Converter
Convert Unix seconds or milliseconds into readable dates, or convert local dates into Unix timestamps.
Unix timestamp
Conversion result
Enter a timestamp or date
Converted timestamp and date values will appear here automatically.
Date and time
Convert machine-readable timestamps into human-readable dates
Unix timestamps are widely used in APIs, databases, authentication systems, distributed applications, and event logs because they represent an absolute point in time.
UTC is the source of truth
Unix timestamps always represent a single instant in UTC. Time zones affect only how that instant is displayed, not the underlying timestamp value.
Watch for unit mismatches
Many APIs use Unix seconds while JavaScript commonly uses milliseconds. Confusing the two can produce dates decades or thousands of years away from the expected value.
Guide
About Unix Timestamp Converter
Unix timestamps represent an instant as elapsed time since the Unix epoch.
This converter handles seconds and milliseconds and displays both UTC and local representations.
Unit and timezone assumptions should always be explicit when exchanging timestamps between systems.
Seconds versus milliseconds
Many APIs use seconds, while JavaScript Date values commonly use milliseconds.
UTC and local display
A timestamp identifies one instant; timezone rules only change how that instant is displayed.
Common integration errors
Unit mismatches, timezone conversion, daylight-saving assumptions, and ambiguous local input often cause incorrect dates.
Typical uses
Timestamps appear in logs, APIs, databases, JWT claims, schedulers, and distributed event systems.
FAQ
Frequently asked questions
What is the Unix epoch?
It begins at 1970-01-01 00:00:00 UTC.
Are Unix timestamps always UTC?
They represent an absolute instant independent of timezone.
How can I tell seconds from milliseconds?
Current millisecond values usually contain about three more digits than second values.
Why is my date far in the future?
Milliseconds may have been interpreted as seconds.
Does daylight saving change the timestamp?
No. It only affects local display rules.
Is conversion performed locally?
Yes, it is intended to run in your browser.
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