JavaScript Date setHours()

const d = new Date();
d.setHours(15);

Description

setHours() sets the hour of a date.

setHours() can also set minutes, seconds and milliseconds.

Set the time to 15:35:01

const d = new Date();
d.setHours(15, 35, 1);

Set the time to 48 hours ago:

const d = new Date();
d.setHours(d.getHours() - 48);

setHours() is an ECMAScript1 (ES1) feature.

ES1 (JavaScript 1997) is fully supported in all browsers:


Chrome	Edge	Firefox	Safari	Opera	IE
Yes	Yes	Yes	Yes	Yes	Yes

Date.setHours(hour, min, sec, millisec)

hour	Required. The Hours. 0 to 23, but other values are allowed: -1 gives the last hour of the previous day 24 gives the first hour of the next day
min	Optional. The Minutes. 0 to 59, but other values are allowed: -1 gives the last minute of the previous hour 60 gives the first minute of the next hour
sec	Optional. The seconds. 0 to 59, but other values are allowed: -1 gives the last second of the previous minute 60 gives the first second of the next minute
millisec	Optional. The milliseconds. 0 to 999, but other values are allowed: -1 gives the last millisecond of the previous second 1000 gives the first millisecond of the next second

A number.

Number of milliseconds between the date and January 1, 1970 00:00:00 UTC.