Developer
Unix Timestamp Converter
Turn Unix timestamps into readable local, UTC and ISO 8601 dates with a relative time summary, or pick a date to get its timestamp. Auto-detects seconds vs milliseconds and includes a one-click Now button.
Examples
Input · Interpreted as seconds.
1735689600
Output
2025-01-01T00:00:00.000Z (UTC)
How to use Unix Timestamp Converter
Enter a timestamp
Type a Unix timestamp in seconds, or paste a 13-digit value for milliseconds.
Or pick a date
Use the date and time picker to get the matching Unix timestamp.
Use Now if needed
Click Now to fill the current timestamp instantly.
Why use this tool
Auto-detects seconds vs millisecond timestamps
Shows local, UTC, ISO 8601 and relative time at once
Two-way conversion between dates and timestamps
Uses the browser's real Date — no server round-trip
Frequently asked questions
Values with 13 or more digits are treated as milliseconds; shorter values are treated as seconds.
Yes. Local time uses your device's time zone, while UTC and ISO outputs are timezone-independent.
Discussion
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