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Timestamp Converter

Put a precise moment on the clock.

Convert Unix seconds or milliseconds to a readable date — or turn a wall-clock time into Unix — with explicit time zone and daylight-saving checks.

Used to display results and interpret the date and time below.

Your browser resolves local time on this device.

Unix → date

Auto-detect common 10-digit seconds and 13-digit milliseconds.

Negative timestamps and up to 3 fractional seconds are supported.

Date → Unix

Times in DST gaps or overlaps are flagged instead of guessed.

Seconds and milliseconds are optional.

  1. 1

    Choose a time zone

    Use your browser's local zone, UTC, or a common IANA region.

  2. 2

    Enter either format

    Paste a Unix value, or choose a human date and clock time.

  3. 3

    Copy the exact value

    Take ISO, UTC, zoned, seconds, or milliseconds output.

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Good to know

Are Unix timestamps affected by time zones?

No. A Unix timestamp identifies one instant worldwide. The selected time zone only changes how that instant is displayed. It does matter when converting a human date and clock time back to Unix.

How does automatic seconds or milliseconds detection work?

Common timestamps with 10 or fewer integer digits are treated as seconds, while 13 or more are treated as milliseconds. Eleven- and twelve-digit inputs are genuinely ambiguous, so the tool asks you to choose the unit instead of guessing.

What happens during a daylight-saving clock change?

Some local times never occur when clocks move forward, and others occur twice when clocks move back. The converter checks the selected IANA zone's rules and reports either case rather than silently choosing the wrong instant.

What do ISO 8601 and UTC mean here?

ISO 8601 is the machine-friendly date ending in Z, which marks UTC. The UTC row expresses the same instant in a readable internet date format. The selected-zone row is a localized display, not a different moment.

Does Humpback upload dates or timestamps?

No. Parsing, IANA time-zone formatting, DST checks, and copying all happen inside this browser tab. Nothing you enter is sent to a server.