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Timestamp converter
Convert between Unix time (seconds or milliseconds), ISO 8601, and readable dates. Numeric values with absolute part below 1011 are treated as seconds; larger values as milliseconds.
Current time
Updates every second.
Unix (seconds)
1787884134
Unix (milliseconds)
1787884134529
ISO 8601 (UTC)
2026-08-28T02:28:54.529Z
Human (local)
Friday, August 28, 2026 at 02:28:54 AM UTC
Human (UTC)
Friday, August 28, 2026 at 02:28:54 AM UTC
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FAQ
When is a number seconds versus milliseconds?
If the absolute integer part is at least 1011, the value is read as milliseconds (typical for Date.now()). Smaller integers are multiplied by 1000 and treated as Unix seconds. You can always paste an ISO string like 2026-04-03T12:00:00Z to avoid ambiguity.
Why do local and UTC differ?
The same instant is shown with your system's time zone rules (local) and with the UTC zone. ISO 8601 output uses UTC with a trailing Z.
Does this call a server?
No. Parsing and formatting use your browser's Date and Intl APIs only.