Unix Timestamp Converter

How to Use

1. Timestamp to Date: Enter a Unix timestamp in the input field. The tool auto-detects whether it is in seconds or milliseconds, or you can manually toggle the unit.
2. Date to Timestamp: Enter a date in any supported format (ISO 8601, YYYY-MM-DD, YYYY/MM/DD, DD/MM/YYYY) and the tool converts it to a Unix timestamp.
3. Live timestamp: The current Unix timestamp is displayed at the top and updates every second, useful for reference or copy-paste.
4. Custom formatting: Use the format string input to display the date in your preferred format. Choose from presets like ISO 8601, US format, EU format, or create your own using YYYY, MM, DD, HH, mm, ss tokens.
5. Copy: Use the copy buttons next to each output to quickly copy the result to your clipboard.
6. Unit toggle: Switch between seconds and milliseconds at any time. All outputs update automatically.

Features

• Two-way conversion — convert timestamps to dates and dates to timestamps
• Auto unit detection — automatically detects seconds vs milliseconds based on digit count
• Live timestamp display — real-time clock showing the current Unix timestamp, updating every second
• Custom date formatting — format dates using YYYY, MM, DD, HH, mm, ss tokens with preset shortcuts
• Multiple date format parsing — supports ISO 8601, YYYY-MM-DD, YYYY/MM/DD, DD/MM/YYYY, and more
• Relative time — shows human-readable relative time like "5 minutes ago" or "in 3 hours"
• Negative timestamp support — handles dates before 1970 (pre-epoch)
• Copy to clipboard — one-click copy for every output value
• Timestamp validation — checks whether a value is a plausible timestamp
• 100% client-side — all processing happens in your browser, no data sent to any server
• Dark mode support — seamless experience in both light and dark themes

Common Use Cases

• API development— Convert timestamps returned by APIs into human-readable dates for logging, debugging, or display.
• Database queries— Convert between Unix timestamps and date formats when working with databases that store epoch values.
• Log analysis— Decode timestamp values in server logs to understand when events occurred.
• Cron job scheduling— Calculate future timestamps for scheduled tasks and verify timing.
• JavaScript development— Bridge the gap between JavaScript's millisecond timestamps and other languages that use seconds.
• System administration— Convert file modification times, process start times, and other system timestamps.
• Data migration— Convert date values between different formats when moving data between systems.
• Testing & debugging— Generate known timestamps for test fixtures and verify date arithmetic logic.