JavaScript Subtract days from Date object
Given a date and the task is to subtract days from the date. To subtract days from date in JavaScript, some methods are used which are described below:
JavaScript getDate() Method: This method returns the day of the month (from 1 to 31) for the defined date.
Syntax:
Date.getDate()
Parameters: This method does not accept any parameters.
Return value: It returns a number from 1 to 31, representing the day of the month.
JavaScript setDate() Method: This method sets the day of month to date object.
Syntax:
Date.setDate(day)
Parameters:
- day: It is required parameter. It specifies the integer representing the day of the month. Values expected values are 1-31, but other values are also 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 the month has 31 days, 32 will result in the first day of the next month.
- If the month has 30 days, 32 will result in the second day of the next month.
Return value: This method return the number of milliseconds between the date object and midnight of January 1, 1970
JavaScript getTime() Method: This method returns the number of milliseconds between midnight of January 1, 1970, and the specified date.
Syntax:
Date.getTime()
Parameters: This method does not accept any parameters.
Return value: It 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 defined number of milliseconds to/from midnight January 1, 1970.
Syntax:
Date.setTime(millisec)
Parameters:
- millisec: It is required parameter. It specifies the number of milliseconds to be added/subtracted, midnight January 1, 1970.
Return value: It represents the number of milliseconds between the date object and midnight January 1, 1970
Example 1: This example subtract 4 days from the var today by using setTime() and getTime() method.
HTML
<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> |
Output:
Subtract days from Date object
Example 2: This example subtract 365 days from the var today by using setDate() and getDate() method.
HTML
<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> |
Output:
Subtract days from Date object
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