Date.now()
Returns the current time as milliseconds since the Unix epoch.
Syntax
Date.now()
Returns
number — Milliseconds elapsed since 1 January 1970 00:00:00 UTC.
Examples
const t = Date.now();
console.log(typeof t);
Output
number
const start = Date.now();
for (let i = 0; i < 1e5; i++) {}
console.log((Date.now() - start) >= 0);
Output
true
Notes
- A static method; no `Date` instance is created.
- Useful for lightweight elapsed-time measurement.
- For sub-millisecond precision use `performance.now()`.
Browser & runtime support
| Environment | Since version |
|---|---|
| chrome | 5 |
| firefox | 3 |
| safari | 4 |
| edge | 12 |
| node | 0.10 |