UtilityBaseDeveloper Tools
Timestamp Converter
Convert Unix timestamps to human dates and back — seconds or milliseconds.
Updated February 20, 2026
How to use the timestamp converter
- 1Paste a timestamp to see it as a local and UTC date — seconds vs milliseconds is auto-detected.
- 2Or pick a date and time to get its Unix timestamp.
- 3Copy the live current timestamp whenever you need 'now'.
Common uses
- Read timestamps found in logs and API responses.
- Compute expiry timestamps for tokens and caches.
- Convert between local time and UTC unambiguously.
Frequently asked questions
What is a Unix timestamp?
The number of seconds elapsed since January 1, 1970, 00:00 UTC (the Unix epoch). It's a compact, timezone-free way to store a moment in time, used across databases, APIs, and logs.
How do I know if a timestamp is seconds or milliseconds?
Length is the giveaway: current timestamps are 10 digits in seconds and 13 in milliseconds. The tool auto-detects and labels which interpretation it used.
Why does the converted date differ from what I expected?
Timezones. A timestamp is absolute, but its rendering depends on the timezone. The tool shows both your local time and UTC so you can see the difference explicitly.
What is the year 2038 problem?
Systems storing timestamps as signed 32-bit integers overflow on January 19, 2038. Modern 64-bit systems and this tool are unaffected.
About this tool
The timestamp converter translates between Unix timestamps and human-readable dates in both directions. It auto-detects whether a pasted number is in seconds or milliseconds, shows the result in both your local timezone and UTC, and displays a live 'current timestamp' you can copy. Going the other way, pick a date and time to get its timestamp. A constant companion for reading logs, debugging APIs, and setting expiry times.
Like everything on UtilityBase, the timestamp converter runs entirely in your browser — nothing you enter is uploaded or stored on a server. It's free to use with no account required. Browse more developer tools here.
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