JavaScript Reference
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Quick Reference

The Date getHours() method returns the hour (0 to 23) of a Date object: 12am = 0, 1am = 1, 2am = 2 … 11pm = 23.

It can also set minutes, seconds and milliseconds.

<!-- html element to place output -->
<p id="my_output"></p>
// variable
let my_date = new Date();

// set date
my_date.setHours(12);

// output to the HTML element
document.getElementById('my_output').innerHTML = my_date.getHours();

Output

12

Syntax

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

Parameters

ValueDescription
hourThe Hours (0 to 23) (required)
Other values:
  • -1 gives the last hour of the previous day
  • 24 gives the first hour of the next day
minThe Minutes (0 to 59)
Other values:
  • -1 gives the last minute of the previous hour
  • 60 gives the first minute of the next hour
secThe seconds (0 to 59)
Other values:
  • -1 gives the last second of the previous minute
  • 60 gives the first second of the next minute
millisecThe milliseconds (0 to 999)
Other values:
  • -1 gives the last millisecond of the previous second
  • 1000 gives the first millisecond of the next second

JavaScript Notes:

  • When using JavaScript, single or double quotation marks are acceptable and work identically to one another; choose whichever you prefer, and stay consistent
  • JavaScript is a case-sensitive language; firstName is NOT the same as firstname
  • Arrays count starting from zero NOT one; so item 1 is position [0], item 2 is position [1], and item 3 is position [2] … and so on
  • JavaScript variables must begin with a letter, $, or _
  • JavaScript variables are case sensitive (x is not the same as X)
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