Unix Timestamp Converter
Translate epoch timestamps into readable human date formats instantly.
Unix Timestamp Converter
Convert Unix seconds or milliseconds to UTC and local browser time.
Date and time
UTC ISO 8601
2023-11-14T22:13:20.000Z
- Local browser time
- Tue Nov 14 2023 22:13:20 GMT+0000 (Coordinated Universal Time)
- Unix seconds
- 1700000000
- Unix milliseconds
- 1700000000000
UTC is the canonical timestamp. Local display uses this browser's time zone and locale; daylight-saving transitions affect only that display.
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What This Calculator Does
The Unix Timestamp Converter translates Unix epoch time (the number of seconds or milliseconds elapsed since January 1, 1970 UTC) into standard ISO 8601 UTC date-time representations and localized browser time.
How It Works
The numeric epoch input is validated against valid JavaScript date ranges (-100,000,000 to +100,000,000 days). Seconds are scaled by 1,000 into milliseconds. A UTC ISO string is generated alongside local time adjusted for your browser time zone and daylight-saving offset.
Example
A timestamp of 1700000000 seconds converts to 2023-11-14T22:13:20.000Z in UTC and provides the corresponding local time for your region.
Formula
Seconds = Floor(Milliseconds / 1000)Elapsed time since 1970-01-01T00:00:00.000ZReading the Results
UTC ISO 8601
The universal, standardized date and time string in UTC without timezone bias.
Local browser time
The date and time formatted for your device current timezone and locale.
Frequently Asked Questions
What is Unix epoch time?
Unix time is a system for tracking time as a single running count of seconds that have passed since 00:00:00 UTC on 1 January 1970 (the Unix epoch).
What is the Year 2038 problem?
Older 32-bit systems store timestamps as signed 32-bit integers, which overflow on 19 January 2038. Modern 64-bit platforms and this browser tool support dates billions of years in the future.
How do I know if my timestamp is in seconds or milliseconds?
10-digit timestamps (e.g. 1700000000) are in seconds; 13-digit timestamps (e.g. 1700000000000) are in milliseconds.