How Timestamp Converter Works
A Unix timestamp counts the number of seconds (or milliseconds) that have passed since 00:00:00 UTC on 1 January 1970 — the Unix epoch. Converting to a date interprets that count against your browser's local time zone as well as UTC; converting to a timestamp does the reverse.
How to Use This Tool
- To read a timestamp: paste it into the left field and select Convert to Date.
- To create a timestamp: pick a date and time on the right and select Convert to Timestamp.
- Use Use Current Timestamp to instantly see right now as a Unix timestamp.
Example
The timestamp 1755600000 (seconds) converts to Tuesday, 19 August 2025, 10:40:00 UTC. A timestamp is in milliseconds instead of seconds if it's 13 digits or more — the tool detects this automatically.
Helpful Tips
- Timestamps in seconds are 10 digits (until the year 2286); timestamps in milliseconds are 13 digits — that length is how the tool tells them apart.
- The ISO 8601 format shown in the result (like
2025-08-19T08:00:00.000Z) is the standard way to represent the same instant unambiguously across systems.
Frequently Asked Questions
What's the difference between seconds and milliseconds timestamps?
Unix timestamps were originally defined in seconds; many programming languages (like JavaScript's Date.now()) use milliseconds instead. This tool detects which one you've entered based on digit count.
Does this account for time zones?
A Unix timestamp itself represents a single, unambiguous instant — the tool shows that instant in both UTC and your browser's local time zone.
Is my input sent anywhere?
No, all conversion happens locally using your browser's Date object.
This tool runs entirely in your browser. Your input is not uploaded to any server.