Javascript date subtract days
A date is given and the task is to subtract days from the date. To subtract days from a date in JavaScript, you use some of the methods described below: JavaScript getDate () Method: This method returns the day of the month (from 1 to 31) for a specific date. Syntax: Returned value: returns a…
A date is given and the task is to subtract days from the date. To subtract days from a date in JavaScript, you use some of the methods described below:
JavaScript getDate () Method: This method returns the day of the month (from 1 to 31) for a specific date.
Syntax:
Date.getDate()
Returned value: returns a number between 1 and 31, representing the day of the month.
JavaScript setDate () Method: This method sets the day of the month for the object’s date.
Syntax:
Date.setDate(day)
Parameters:
- day: this is a required parameter. Specifies an integer representing the day of the month. Values of the expected values are: 1-31, but other values are allowed.
- 0 will result in the last day of the previous month.
- -1 will result in the day before the last day of the previous month.
- If a month has 31 days, 32 will result in the first day of the next month.
- If a month has 30 days, 32 will result in the second day of the next month.
Return value: returns a number representing the number of milliseconds between the object’s date and midnight on January 1, 1970.
JavaScript getTime () method: this method returns the number of milliseconds between midnight on January 1, 1970, and the specified date.
Syntax:
Date.getTime().
Return value: Returns a number representing the number of milliseconds since midnight on January 1, 1970.
JavaScript setTime () method: this method sets the date and time by adding / subtracting a specific number of milliseconds to / from midnight on January 1, 1970.
Syntax:
Date.setTime(millisec)
Parameters:
- millisec: This is a required parameter. It specifies the number of milliseconds to be added / subtracted at midnight on January 1, 1970.
Return value: represents the number of milliseconds between the object date and midnight of January 1, 1970.
Example 1:
In this example, subtract 4 days from the today variable using the setTime () and getTime () methods .
<!DOCTYPE HTML>
<html>
<head>
<title>
Subtract days from Date object
</title>
</head>
<body style = "text-align:center;">
<h1 style = "color:green;" >
GeeksForGeeks
</h1>
<p id = "GFG_UP" style = "font-size: 15px; font-weight: bold;">
</p>
<button onclick = "gfg_Run()">
subtractDays
</button>
<p id = "GFG_DOWN" style =
"color:green; font-size: 20px; font-weight: bold;">
</p>
<script>
var el_up = document.getElementById("GFG_UP");
var el_down = document.getElementById("GFG_DOWN");
var today = new Date();
el_up.innerHTML = "Today's date = " + today;
Date.prototype.subtractDays = function(d) {
this.setTime(this.getTime() - (d*24*60*60*1000));
return this;
}
function gfg_Run() {
var a = new Date();
a.subtractDays(4);
el_down.innerHTML = a;
}
</script>
</body>
</html> Result:
- Before you press the button:
- After pressing the button:
Example 2:
In this example, subtract 365 days from the today variable using the setDate () and getDate () methods.
<!DOCTYPE HTML>
<html>
<head>
<title>
Subtract days from Date object
</title>
</head>
<body style = "text-align:center;">
<h1 style = "color:green;" >
GeeksForGeeks
</h1>
<p id = "GFG_UP" style = "font-size: 15px; font-weight: bold;">
</p>
<button onclick = "gfg_Run()">
subtractDays
</button>
<p id = "GFG_DOWN" style =
"color:green; font-size: 20px; font-weight: bold;">
</p>
<script>
var el_up = document.getElementById("GFG_UP");
var el_down = document.getElementById("GFG_DOWN");
var today = new Date();
el_up.innerHTML = "Today's date = " + today;
Date.prototype.subtractDays= function(d) {
this.setDate(this.getDate() - d);
return this;
}
function gfg_Run() {
var a = new Date();
a.subtractDays(365);
el_down.innerHTML = a;
}
</script>
</body>
</html> Result:
- Before you press the button:
- After pressing the button:
