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About Epoch Time Converter – Unix Timestamp to Human Date
Perform bidirectional conversions between Unix epoch timestamps and human-readable calendar dates.
Support seconds, milliseconds, automatic unit detection, UTC ISO 8601 formatting, and local browser time with a live ticker.
Input is processed locally in your browser and is not sent to Navorika.
How the calculation works
Unix Epoch Baseline
The Unix epoch is defined as 00:00:00 UTC on 1 January 1970. Epoch seconds count the elapsed SI seconds since that instant.
Unit Auto-Detection
Values with 10 digits (~1.7e9) are detected as seconds, while 13-digit values (~1.7e12) are interpreted as milliseconds.
How to use this tool
- 1Select Epoch → Human Date to convert a numeric timestamp, or Date/Time → Epoch to convert a calendar date.
- 2Enter the timestamp or pick a calendar date, time, and timezone assumption.
- 3Review formatted UTC, ISO 8601, RFC 2822, and local time representations.
- 4Copy individual timestamp formats or date strings with one click.
Understanding the result
ISO 8601 strings ending in Z represent universal coordinated time (UTC).
Local time includes your system timezone offset and daylight saving time adjustments.
Important limitations
- Unix time does not account for leap seconds; every day is treated as having exactly 86,400 seconds.
- JavaScript Date objects support dates from roughly -100,000,000 days to +100,000,000 days relative to the epoch.
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Frequently asked questions
What is the Year 2038 problem?
Legacy 32-bit signed integers overflow at 2,147,483,647 seconds (03:14:07 UTC on 19 January 2038). Modern 64-bit systems handle timestamps billions of years into the future.
How does auto-detection distinguish seconds and milliseconds?
Timestamps with 12 or more digits are recognized as milliseconds, while 10-digit timestamps represent seconds for modern dates.
Can I convert dates before 1970?
Yes. Negative epoch timestamps represent dates prior to 1 January 1970.
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