Convert Unix timestamps to human-readable dates and back. Supports seconds and milliseconds, UTC and local time, plus ISO 8601 output for developers.
Choose your path
Convert a numeric epoch value with an explicit or disclosed inferred unit into one instant and multiple IANA-zone displays, and convert timezone-free form input only under a user-selected local or UTC basis.
Distinguish seconds from milliseconds and preserve one UTC instant across displays.
Select or inspect the resolved unit, compare ISO/RFC/UTC/IANA output, then save the unit and timezone assumptions.
Can reproduce the instant without a hidden 1,000× unit shift.
Avoid ambiguous EST/PST/CST labels and browser-local date parsing surprises.
Use UTC for exchange, inspect named IANA zones with actual offset abbreviation, and record the host Intl/IANA dependency.
Correlates events without treating a seasonal abbreviation as a fixed zone.
Choose whether a timezone-free `datetime-local` value means browser local time or UTC and keep edits stable.
Enter the date, choose basis, inspect seconds/milliseconds, and confirm the live clock does not overwrite input.
Gets a stable, explicit conversion even across a live clock update.
Outputs and checklists are planning aids. Review the linked current authorities and the records, terms, instructions, and requirements that apply to your exact situation before a consequential decision.
This tool is part of these guided projects. Each project provides step-by-step instructions with checklists and all the tools you need in one place.
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Unix time counts seconds (or milliseconds) since January 1, 1970 00:00:00 UTC — the Unix epoch. Negative values represent dates before 1970.
Timestamp (seconds) = (Date − Epoch) ÷ 1000The same instant has a millisecond value 1,000× its second value. The page offers explicit seconds and milliseconds choices; Auto uses a documented magnitude threshold and always displays the resolved unit, so digit length is never treated as proof.
ISO 8601 represents dates as YYYY-MM-DDTHH:mm:ss.sssZ (UTC) or with a numeric timezone offset (+05:30). It is the standard interchange format for APIs, logs, and databases.
Updated: July 2026
Convert a Unix timestamp from a JSON API response to a readable date.
→ 2024-01-01 00:00:00 UTC
A developer converts a millisecond timestamp from browser console output.
→ Same date — detected as milliseconds automatically
Convert a Unix epoch stored as an INTEGER in a database row to verify the record creation date.
→ 2023-01-01 00:00:00 UTC
Do not infer a unit from digit count alone. Select seconds or milliseconds from the producer's contract, or record the page's displayed Auto inference before using the result.
Unix timestamps are always UTC. Displaying in local time adds your timezone offset. When comparing logs from different regions, convert all values to UTC first.
Convert between Unix epoch timestamps and readable dates in seconds or milliseconds. Essential for debugging API responses, log files, database records, and any system that stores time as a numeric epoch value.