Free browser tool · No signup
Unix Timestamp Converter
Convert Unix seconds or milliseconds to UTC and local time, or convert a UTC date to a timestamp.
Your input stays in this browser. No API calls or server uploads.
How to use the unix timestamp converter
Select seconds or milliseconds explicitly, then convert a timestamp. For the reverse conversion, enter a date and time in UTC. Use Now to fill the current instant.
Supported features and limitations
UTC input does not use your device time zone. Local output follows your browser time zone. Seconds may have up to three decimal places; milliseconds must be integers. Leap seconds are not represented.
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