Epoch & Timezone Converter
Utilix Epoch & Timezone Converter is a developer temporal utility that auto-detects 10-digit (seconds), 13-digit (milliseconds), and 19-digit (nanoseconds) Unix timestamps and renders ISO-8601, UTC, and multi-city timezone conversions.
How to Convert 10-Digit and 13-Digit Unix Timestamps to ISO-8601 and Local Time?
Paste any Unix epoch integer or ISO-8601 date string into Utilix Epoch & Timezone Converter to automatically detect precision (seconds vs milliseconds vs nanoseconds) and view synchronized timestamps across UTC, San Francisco, New York, London, Berlin, and Tokyo.
How to use Epoch & Timezone Converter
- Paste Unix Epoch or ISO Date: Enter a 10/13/19-digit timestamp or ISO date, or click Use Current Time.
- Check Auto-Detected Precision & ISO-8601: Review whether the input is seconds, milliseconds, or nanoseconds.
- Compare Across Global Developer Timezones: Inspect the 6-city timezone grid and copy any formatted timestamp.
Frequently asked questions
How does Utilix distinguish between seconds, milliseconds, and nanoseconds?
10-digit integers represent seconds since Jan 1, 1970 UTC; 13-digit integers represent JavaScript/Java milliseconds; and 16–19 digit integers represent Go/Linux nanoseconds.
Can I convert a human-readable ISO-8601 date back into Unix seconds?
Yes! Paste any ISO string like `2026-11-13T10:30:00Z` and both Epoch Seconds and Epoch Milliseconds are calculated immediately.
Does the multi-city grid handle Daylight Saving Time (DST) automatically?
Yes, `Intl.DateTimeFormat` uses the browser’s IANA timezone database (`America/New_York`, `Europe/London`, etc.) to apply exact historical and current DST offsets.
Is it safe from the 32-bit Year 2038 overflow bug?
Yes, JavaScript uses 64-bit IEEE-754 safe integers supporting dates up to ±270,000 years.
Can I copy the ISO-8601 output in 1 click?
Yes, click Copy Output or press Ctrl+Shift+C.