Unix Timestamp Converter Online
Convert a Unix timestamp to a date, or a date to a Unix timestamp — instantly, entirely in your browser.
Unix timestamp
Date and time (your local timezone)
Never uploaded
Every conversion runs entirely in your browser, using your device's own clock and timezone.
UTC and local, together
Every result shows local time, UTC, and ISO 8601 side by side — no ambiguity.
Free, no limit
No account, and no limit on how many conversions you can do.
What is a Unix Timestamp?
A Unix timestamp (or epoch time) is the number of seconds that have elapsed since 00:00:00 UTC on January 1, 1970 — a single number that unambiguously identifies a moment in time regardless of timezone. It's widely used in databases, APIs, log files, and programming languages as a compact, sortable way to store dates.
How to Convert a Timestamp Online
- Choose a direction. "Timestamp → Date" converts a Unix timestamp into a readable date; "Date → Timestamp" converts a date you pick into a Unix timestamp.
- Enter your value. For a timestamp, paste the number and pick whether it's in seconds or milliseconds. For a date, use the date/time picker.
- Read the results. Local time, UTC time, ISO 8601, and (for timestamps) a relative description like "3 hours ago" all appear instantly.
- Copy any value. Each result row has its own Copy button.
Seconds vs. Milliseconds
The standard Unix timestamp is measured in seconds, but many programming languages — including JavaScript's own Date.now() — return milliseconds instead. Pasting a millisecond value into a seconds-only converter (or vice versa) produces a wildly wrong date, usually decades off. This tool's Seconds/Milliseconds toggle makes sure the conversion matches whichever unit your value is actually in.
Frequently Asked Questions
How do I convert a Unix timestamp to a date?
Switch to "Timestamp → Date", paste the number, and the local date/time, UTC date/time, ISO 8601 format, and a relative description ("3 hours ago") all appear instantly.
How do I convert a date to a Unix timestamp?
Switch to "Date → Timestamp", pick a date and time using the picker, and the Unix timestamp in both seconds and milliseconds appears instantly, along with its ISO 8601 form.
What is a Unix timestamp?
A Unix timestamp (or epoch time) is the number of seconds that have elapsed since 00:00:00 UTC on January 1, 1970 — a single number that unambiguously identifies a moment in time regardless of timezone.
Is a Unix timestamp in seconds or milliseconds?
The standard Unix timestamp is in seconds, but many programming languages and APIs (including JavaScript's Date.now()) use milliseconds instead. This tool has a Seconds/Milliseconds toggle so you can convert either correctly.
What is ISO 8601?
ISO 8601 is a standardized text format for dates and times, like 2026-01-15T10:30:00.000Z — unambiguous, sortable as plain text, and understood by virtually every programming language and database.
Does it account for my timezone?
Yes — the local date/time shown uses your browser's timezone, while the UTC and ISO 8601 values are always shown in UTC so they're unambiguous regardless of where you or anyone else is located.
Is my data uploaded anywhere?
No. All conversion happens entirely in your browser using your device's own clock and timezone — nothing is sent to CurePDF's servers.
Is the timestamp converter free?
Yes, with no account required and no limit on how many conversions you can do.