UNIX Time Converter
Convert UNIX timestamps (seconds or milliseconds) to UTC/local time and back.
The tool auto-detects whether the input is 10-digit seconds or 13-digit milliseconds
and updates all fields in real time with no API calls.
View ISO 8601 output, human-readable strings, and the detected weekday.
Quick actions let you copy any field, jump to the current time, auto-refresh every second, or clear inputs.
All calculations are done in your browser using the native Date and Intl APIs.
Auto-detects seconds or milliseconds
Auto-syncs with UNIX input. Accepts local time.
How to use & features
- 10 digits are treated as seconds, 13 digits as milliseconds automatically.
- Editing the date/time field keeps the UNIX timestamp in sync.
- Use the copy buttons to quickly grab any value for logs or scripts.
Sample input & output
Get UNIX time from ISO date
Input
2024-02-01T00:00:00Z
Output
1706745600
Frequently asked questions
Should I enter seconds or milliseconds?
Are UTC and local times shown?
Can I convert to other formats?
Common use cases
Interpreting timestamps
Convert UNIX times into readable dates to understand when logs or events occurred.
Computing expirations
Translate specific dates into UNIX seconds or milliseconds for cache or token TTLs.
Checking timezone differences
Compare local times with UTC equivalents to ensure environments stay in sync.
Notes & limitations
Work stays in your browser
Inputs and outputs remain local. Closing the tab or clearing cache will remove any temporary state.
Validate critical data
Results are helper outputs—double-check them before sending to production systems or sharing externally.
Large payloads depend on your device
Very large text or files can feel slow in some browsers. Use a desktop environment for heavy workloads.