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Timestamp converter

Getting ready…

Timestamp converter User guide

Convert seconds, milliseconds and ISO dates in a selected time zone.

Instructions

  1. Enter one timestamp or ISO date per line. ISO values must include Z or an offset such as +09:00.
  2. Choose seconds or milliseconds for numeric input and an IANA display time zone.
  3. Convert, inspect UTC, local dates and both numeric units, then save CSV or JSON.

Example

Input / settings

0 seconds · UTC

Result / checks

1970-01-01T00:00:00.000Z

Numeric units are never guessed from digit count. Zero seconds is 1970-01-01T00:00:00Z.

Please note

Text → CSV / JSON

  • Numeric units are never guessed from digit count. Zero seconds is 1970-01-01T00:00:00Z.
  • Example zones: UTC, Asia/Seoul and America/New_York. Invalid calendar dates and dates without offsets are rejected.
  • Files and entered content are processed in this browser. Save results before closing the page.