How to set time in javascript

Javascript method to set time: 1. [setFullYear()] method sets the year of the date object; 2. [setMonth()] method sets the month of the date object; 3. [setDate()] method sets the date The date of the object.

The operating environment of this tutorial: Windows 7 system, JavaScript version 1.8.5, DELL G3 computer.

Javascript method to set time:

setFullYear() method

setFullYear() method sets the year of the date object. This example is set to 2020:

Instance

<script>
var d = new Date();
d.setFullYear(2020);
document.getElementById("demo").innerHTML = d;
</script>

setFullYear() method can optionally set the month and day:

Instance

<script>
var d = new Date();
d.setFullYear(2020, 11, 3);
document.getElementById("demo").innerHTML = d;
</script>

setMonth () Method

setMonth() method sets the month of the date object (0-11):

Instance

<script>
var d = new Date();
d.setMonth(11);
document.getElementById("demo").innerHTML = d;
</script>

setDate() method

setDate() method sets the day of the date object (1-31):

Example

<script>
var d = new Date();
d.setDate(15);
document.getElementById("demo").innerHTML = d;
</script>

The setDate() method can also be used to add days to a date:

Example

<script>
var d = new Date();
d.setDate(d.getDate() + 50);
document.getElementById("demo").innerHTML = d;
</script>

If you add days, switch months or years, the changes will be handled automatically by the Date object.

setHours() method

setHours() method sets the hour (0-23) of the date object:

Example

<script>
var d = new Date();
d.setHours(22);
document.getElementById("demo").innerHTML = d;
</script>

setMinutes() method

setMinutes() method sets the minutes of the date object (0-59):

Instance

<script>
var d = new Date();
d.setMinutes(30);
document.getElementById("demo").innerHTML = d;
</script>

setSeconds () Method

setSeconds() method sets the seconds of the date object (0-59):

Example

<script>
var d = new Date();
d.setSeconds(30);
document.getElementById("demo").innerHTML = d;
</script>

Compare dates

Dates can be easily compared.

The following example compares today with January 16, 2049:

Example

var today, someday, text;
today = new Date();
someday = new Date();
someday.setFullYear(2049, 0, 16);
if (someday > today) {
  text = "今天在 2049 年 1 月 16 日之前";
} else {
  text = "今天在 2049 年 1 月 16 日之后";
}
document.getElementById("demo").innerHTML = text;

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