Question 1

What is a Unix timestamp?

Accepted Answer

A Unix timestamp (also called Epoch time or POSIX time) is the number of seconds that have elapsed since January 1, 1970, at 00:00:00 UTC. It is widely used in programming, databases, and APIs to represent points in time as a single integer, making date arithmetic and timezone handling simpler.

Question 2

What is the difference between seconds and milliseconds timestamps?

Accepted Answer

A seconds-based Unix timestamp is typically 10 digits (e.g., 1739487600), while a millisecond timestamp is 13 digits (e.g., 1739487600000). JavaScript's Date.now() returns milliseconds, while many APIs and databases use seconds. This tool supports both formats.

Question 3

Is this timestamp converter free to use?

Accepted Answer

Yes, QTool.io's Unix Timestamp Converter is completely free with no signup required. It runs entirely in your browser, so your data stays private. Convert unlimited timestamps in both directions with timezone support.

Question 4

What date formats does this tool support?

Accepted Answer

The converter outputs dates in multiple formats: ISO 8601, UTC string, RFC 2822, local date/time, date only, and time only. It also shows relative time (e.g., '3 hours ago' or 'in 2 days') for quick reference.

Free Unix Timestamp Converter

Timestamp to Date

Date to Timestamp

Need something more powerful?

QTool.io on GitHub