Unix timestamp converter
Convert Unix seconds or milliseconds to ISO time, or convert a timezone-qualified ISO time back.
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How to use it
Choose a direction and unit, then enter a timestamp or ISO date.
Good to know
ISO input must include a timezone, such as Z or +05:30.
Turn a timestamp into a readable UTC time
Choose seconds or milliseconds before converting. The value 1704067200 in seconds becomes 2024-01-01T00:00:00.000Z.
Convert ISO time in the other direction
For ISO to timestamp, include a timezone: 2024-01-01T00:00:00Z converts to 1704067200 when seconds are selected. An offset such as +05:30 is accepted and converted to the same UTC moment.
Dates without a timezone are rejected because their meaning is ambiguous. This tool uses Unix time and ISO timestamps; it does not interpret local calendar schedules or daylight-saving rules for a city.