Relative Time-
Local Time-
UTC Time-
ISO 8601-
Unix Epoch (Seconds)-
Unix Epoch (Milliseconds)-
Unix Timestamp Converter (Offline & Secure)
Free online Unix timestamp converter — convert epoch seconds or milliseconds to UTC, local time, and ISO 8601. Also converts dates back to epoch. Runs in your browser.
How to use Unix Timestamp
- Enter a Unix epoch integer (e.g. 1770000000) to convert it to UTC, Local Time, and ISO 8601 formats.
- Enter a date string (e.g. '2025-01-01') to convert it to a Unix epoch integer.
- Click 'Now' to instantly populate with the current timestamp.
- The tool auto-detects whether the input is in seconds or milliseconds.
- Click the copy icon on any result card to copy the value.
Edge Cases & Important Considerations
- Timestamps above 10,000,000,000 are treated as milliseconds, below as seconds.
- Invalid date strings will show an error in the status bar.
- Relative time is calculated from the current browser clock.
Keyboard Shortcuts
- Ctrl/Cmd + K — Open Command Palette to switch tools instantly.
Frequently Asked Questions
Is this Unix Timestamp safe for sensitive corporate data?
Yes, 100%. All processing runs client-side in your local browser memory. No text, tokens, payloads, or logs are ever transmitted to any remote server or analytics engine.
Can I use this tool offline?
Yes. Because this tool runs strictly on client-side JavaScript with zero external API dependencies, once loaded it functions completely offline.
100% Client-Side Privacy Guarantee
All inputs are processed entirely inside your browser's memory using JavaScript. No data is ever transmitted to any server. Your tokens, JSON payloads, cURL commands, and timestamps never leave your machine.