Free online timestamp and date converter
Convert Unix epoch timestamps to human-readable dates - and convert calendar dates back to Unix seconds or milliseconds. Use Timestamp to Date or Date to Timestamp, with UTC or local timezone, privately in your browser.
What you can do
Timestamp to date
Paste Unix seconds or milliseconds and get ISO, UTC, local, and relative readings instantly.
Date to timestamp
Pick a calendar date and time (local or UTC) and copy the matching Unix seconds or milliseconds.
Private by default
All conversion runs in your browser. Nothing is uploaded to convert a timestamp or date.
Seconds vs milliseconds
Unix time is usually stored as seconds since 1970-01-01T00:00:00Z (about 10 digits today) or as milliseconds (about 13 digits). Mixing them is the most common conversion bug - a seconds value treated as milliseconds lands in 1970; a milliseconds value treated as seconds lands far in the future. Read seconds vs milliseconds.
On Timestamp to Date, values with absolute magnitude around 1e11 or larger are treated as milliseconds (for example 1710000000000). Smaller numbers are treated as seconds (for example 1710000000). Fractional seconds such as 1710000000.5 are supported. JWT exp and iat claims are almost always seconds.
UTC vs local time
- UTC
- Coordinated Universal Time - the same instant worldwide. Prefer UTC when comparing logs, APIs, and databases across regions.
- Local
- Your browser's timezone offset applied to the same instant. Use local when you need to match what a user saw on screen. Daylight saving changes the local display, not the underlying Unix epoch value.
On Date to Timestamp, Local interprets the calendar fields in your timezone; UTC treats those numbers as a UTC clock. The resulting epoch number changes depending on which you choose.
How to use this converter
- Choose Timestamp to Date to paste Unix time, or Date to Timestamp to pick a calendar date.
- Use Now for the current moment, or Sample for a fixed example.
- In Date to Timestamp, type a date (YYYY-MM-DD) or open the calendar, set hours / minutes / seconds, then choose Local timezone or UTC.
- Copy Unix seconds, milliseconds, ISO, or other rows from the results table.
Common examples
1710000000- Unix seconds to date2024-03-09 16:00 UTC- date to Unix (Date to Timestamp tab)2026-08-06T15:30:00.000Z- ISO 8601 in the Timestamp to Date field
Frequently asked questions
Learn more about timestamps
Related tools: JWT decoder, Regex tester, JSON formatter.
Why convert timestamps and dates?
Logs, databases, APIs, and tokens often store time as epoch numbers, while humans work with calendars. A two-way converter turns either form into the other while debugging expiry, scheduling, and analytics - without sending data to a server.