Date

Date and time utilities.

Date.now()

Returns the number of milliseconds since the Unix epoch (January 1, 1970 00:00:00 UTC).

const timestamp = Date.now();
console.log(timestamp);    // e.g. 1700000000000

new Date()

Create a Date object with the current time.

const now = new Date();

new Date(ms)

Create a Date object from a millisecond timestamp.

const d = new Date(1705318245000);

Instance Methods

Time

d.getTime()         // number — milliseconds since epoch

Date Components (local time)

d.getFullYear()     // number — 4-digit year (e.g. 2024)
d.getMonth()        // number — month (0-11, 0 = January)
d.getDate()         // number — day of month (1-31)
d.getHours()        // number — hours (0-23)
d.getMinutes()      // number — minutes (0-59)
d.getSeconds()      // number — seconds (0-59)

Formatting

d.toISOString()     // string — "2024-01-15T11:30:45Z" (UTC)

Example

const start = Date.now();

// ... do some work ...

const elapsed = Date.now() - start;
console.log("Elapsed ms:");
console.log(elapsed);

const d = new Date();
console.log(d.getFullYear());
console.log(d.toISOString());

Native Implementation

API	Maps to
Date.now()	gettimeofday()
new Date()	gettimeofday() + store ms in %Date struct
getFullYear() etc.	localtime_r() + struct tm field access
toISOString()	gmtime_r() + strftime()