Unix Timestamp Calculator
Convert between a Unix timestamp and a human date (UTC/ISO). Enter your values, click Calculate, and get the full result with its breakdown — everything is processed on your device, nothing is sent to a server.
All calculations run in your browser. Your data is never sent to our servers.
Example
Example Input
1577836800
Example Output
2020-01-01T00:00:00.000Z
How to Use
- 1Fill in each input field with the values you want to compute.
- 2If there are choices (units, mode, operation), pick what you need.
- 3Click the Calculate button (or press Ctrl+Enter).
- 4The main result and its breakdown appear in the Result area. Click Copy to copy it.
About the Unix Timestamp Calculator
The Unix Timestamp Calculator converts a Unix timestamp (seconds or milliseconds since Jan 1 1970 UTC) into a human date — and back, from a date to a timestamp. It auto-detects seconds vs milliseconds.
Useful for debugging logs, APIs, and databases that store time as timestamps.
FAQ
Is this Unix Timestamp Calculator accurate?
Yes. It uses standard formulas and runs directly in your browser at full JavaScript precision (plus BigInt/decimal.js for large numbers where needed).
Is my data sent to a server?
No. All calculations happen entirely on your device. No values are sent to or stored on our servers.