Unix Timestamp Converter
The problem: API logs, database records and backend events use Unix timestamps that are meaningless numbers until converted — and the conversion direction varies constantly.
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Unix Timestamp Converter: the complete guide
A Unix timestamp converter translates between Unix epoch time (the number of seconds since January 1, 1970 at 00:00:00 UTC) and human-readable date representations — essential for backend developers, database administrators, API debuggers and log analysts. Unix timestamps appear in API responses, database fields (created_at, updated_at), JWT token claims (iat, exp, nbf), server logs, HTTP headers (Last-Modified, Expires) and event tracking systems. Converting them by hand requires a calculator, but this tool does it instantly in both directions.
Unix timestamp vs milliseconds
A standard Unix timestamp is measured in seconds (10-digit number for dates in the 2000s, e.g. 1700000000). JavaScript's Date.now() returns milliseconds (13-digit number). Many APIs — particularly those handling high-frequency events — use milliseconds. This converter auto-detects whether a number is seconds or milliseconds based on its length, so you can paste either format without specifying.
ISO 8601 and its formats
ISO 8601 is the international standard for date and time representation: 2024-01-15T09:30:00Z (UTC), 2024-01-15T15:00:00+05:30 (IST), or 2024-01-15T09:30:00.000Z (millisecond precision). It is the format used by JSON APIs (RFC 3339), HTML datetime-local inputs, database timestamp columns, AWS CloudWatch logs and most modern backend systems. This converter accepts ISO 8601 strings as input and outputs them as well.
Step by step: how to use Timestamp
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Paste a Unix timestamp (seconds or milliseconds) or an ISO 8601 date string in the input field.
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Alternatively, click 'Now' to load the current timestamp.
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All representations update instantly: Unix, milliseconds, ISO 8601, UTC, local time and relative time.
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Review the date components panel for year, month, day, hour, minute, second and weekday.
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Copy any individual representation using the copy button next to each field.
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Use the timezone reference table to understand offsets for common regions.
Security & privacy
Timestamp conversion uses the browser's native Date object and Intl.DateTimeFormat API — no external libraries, no server calls. Timestamps from JWT tokens, API logs or database records that you paste here are processed locally and never transmitted. The tool works fully offline after initial page load.