Epoch Questions, Answered

Unix time, also known as epoch or POSIX time, measures elapsed seconds from 00:00:00 UTC on January 1, 1970. Many platforms use the same scale in milliseconds.

Both are widely used. A present-day value in seconds is normally 10 digits; the millisecond equivalent is usually 13. Timestamp2 lets you choose either unit and guesses the likely one when you paste a value.

Enter or paste the epoch number, confirm its unit, then pick a time zone. Timestamp2 immediately shows the local date, zone abbreviation and ISO 8601 representation.

Set the date and clock time, choose the time zone where that wall-clock reading occurs, then copy the calculated value in seconds or milliseconds.

No. An epoch value identifies one absolute instant. Time-zone and daylight-saving rules only affect how that instant is displayed, or how an entered local time maps back to the timeline.

Yes. Select UTC, a familiar fixed offset such as GMT+2, or an IANA location such as Europe/Sofia, America/New_York or Asia/Tokyo. Location-based zones include historical daylight-saving rules.

Yes. Negative values represent instants before the Unix epoch, and fractional seconds work when you convert an epoch value into a date.

Legacy software may keep epoch seconds in a signed 32-bit integer, which overflows on that date. Systems using 64-bit storage can represent a far larger time span.

No. Every conversion runs in your browser. Only your selected time zone and color-mode preference are stored locally on the device.