Unix Timestamp to Date Converter
Convert Unix epoch timestamps to human-readable date formats — auto-detects seconds vs milliseconds.
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What is the Unix Timestamp to Date Converter?
Unix timestamps count seconds since the Unix epoch (January 1, 1970 00:00:00 UTC). Converting them to human-readable dates requires accounting for leap seconds, timezone offsets, and daylight saving transitions. This converter uses JavaScript's native Date object and Intl.DateTimeFormat API for locale-aware formatting, automatically detecting whether the input is in seconds (10 digits) or milliseconds (13 digits) and displaying the result across multiple formats simultaneously.
How to use the Unix Timestamp to Date Converter?
- Enter a Unix timestamp (seconds or milliseconds) into the input field.
- The converter auto-detects format: ≤10 digits = seconds, >10 digits = milliseconds.
- Instantly view the date in UTC, your local timezone, ISO 8601 format, and relative time.
- Click 'Now' to load the current Unix timestamp for reference.
- All conversion uses browser-native JavaScript Date — no server calls.
Frequently Asked Questions
What is a Unix timestamp?
A Unix timestamp (epoch time) is the number of seconds elapsed since January 1, 1970 00:00:00 UTC. It provides a timezone-independent way to represent a specific moment in time.
How do I tell if a timestamp is seconds or milliseconds?
Seconds timestamps are typically 10 digits (e.g. 1700000000). Milliseconds timestamps are 13 digits (e.g. 1700000000000). JavaScript's Date.now() returns milliseconds.
What is the maximum Unix timestamp?
On 32-bit systems, the maximum is 2,147,483,647 (January 19, 2038). JavaScript uses 64-bit numbers, supporting dates far beyond this limit.
Is this converter safe?
Yes. All conversion runs in your browser using native JavaScript Date APIs. No data is sent anywhere.