Epoch & Timezone Converter
Convert Unix timestamps to human-readable dates across timezones, with a live epoch counter.
About the Epoch & Timezone Converter
Unix time counts the whole seconds elapsed since midnight UTC on January 1, 1970 — the "epoch." It's the standard internal representation for time across operating systems, databases, and APIs because it's a single number with no timezone or calendar ambiguity, unlike a formatted date string. Software converts it to a human- readable date only at the point of display, applying whatever timezone the viewer needs.
To use it: paste a Unix timestamp (in seconds) into the input, pick a target timezone, and see it converted into a local date/time, an ISO 8601 string, and a relative phrase like "3 days ago." For example, the timestamp 0 converts to exactly midnight, January 1, 1970 in UTC, while 1000000000 converts to September 9, 2001 — famously the day the Unix epoch counter crossed one billion seconds. Click "Use current time" to grab "now" as a timestamp for testing or debugging, or watch the live counter at the top, which ticks up by exactly one every second.
What is a Unix timestamp?+−
The number of seconds elapsed since midnight UTC on January 1, 1970 (the "Unix epoch").
Why do timestamps sometimes come in milliseconds instead of seconds?+−
Unix time is defined in seconds, but many programming languages and APIs (like JavaScript's Date.now()) report milliseconds for finer precision. If a number looks 1,000× too large, divide by 1,000 before pasting it here.
Can Unix timestamps be negative?+−
Yes — negative values represent dates before January 1, 1970 UTC. This tool converts those the same way as positive timestamps, so you can look up historical dates too.
Why does the same timestamp show different clock times in different timezones?+−
A Unix timestamp represents one single, unambiguous instant in time. The timezone selector only changes how that instant is displayed — the actual moment referenced never changes, just its local calendar representation.
Does the timezone conversion account for daylight saving time automatically?+−
Yes — conversions use the browser's built-in Intl timezone database, which tracks each region's daylight saving rules, so results are correct whether the date falls in standard or daylight time.
What is ISO 8601 and why is it shown alongside the local time?+−
ISO 8601 (e.g. 2026-09-16T14:30:00.000Z) is an unambiguous, sortable date-time format used widely in APIs, logs, and databases — useful to copy directly into code or a database query instead of a locale-specific date string.