Unix Timestamp Converter

Convert Unix epoch timestamps (seconds and milliseconds) to UTC, ISO 8601, and local time.

Tool Guide

Unix Timestamp Converter: What It Does

Converts between Unix epoch timestamps (seconds and milliseconds) and human-readable UTC and local calendar dates. It provides relative time calculations, timezone offsets, and ISO 8601 strings.

Example

Input
1700000000
Output
2023-11-14T22:13:20.000Z

Converts seconds since the Unix epoch (January 1, 1970 UTC) to an ISO timestamp.

How to Use

  1. Enter an epoch timestamp in seconds or milliseconds, or pick a date on the calendar.
  2. Review the converted outputs across UTC, local time, and ISO 8601.
  3. Click Now to grab the current epoch timestamp.

Limitations

  • Dates prior to 1970 yield negative integer timestamps.
  • 32-bit signed integer timestamps overflow on January 19, 2038 (the Year 2038 problem).

Frequently Asked Questions

How can I tell whether an epoch timestamp is in seconds or milliseconds?

10-digit timestamps (e.g. 1700000000) are in seconds, while 13-digit numbers (e.g. 1700000000000) represent milliseconds.

Why do timestamps not account for historical leap seconds?

Unix time intentionally ignores leap seconds; every day is treated as having exactly 86,400 SI seconds to simplify calendar math.

Command-Line Equivalent
date +%s

Print the current Unix epoch timestamp in seconds.

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