The Date object is a data type built into the JavaScript language. Date objects are created with the new Date( ) as shown below.
Once a Date object is created, a number of methods allow you to operate on it. Most methods simply allow you to get and set the year, month, day, hour, minute, second, and millisecond fields of the object, using either local time or UTC (universal, or GMT) time.
The setSeconds() function of the date object accepts an integer representing the seconds and replaces the value of the seconds in the current date with it.
Syntax
Its Syntax is as follows
dateObj.setSeconds();
Example
<html>
<head>
<title>JavaScript Example</title>
</head>
<body>
<script type="text/javascript">
var dateObj = new Date('september 26, 89 5:4:25:96');
document.write("Current date: "+dateObj.toUTCString());
document.write("<br>");
dateObj.setSeconds(9);
document.write("Date after setting the seconds: "+dateObj.toUTCString());
</script>
</body>
</html>Output
Current date: Mon, 25 Sep 1989 23:34:25 GMT Date after setting the seconds: Mon, 25 Sep 1989 23:34:09 GMT
Example
Though you do not mention the hours of the day while creating the date object, You can still set it using the setSeconds() function.
<html>
<head>
<title>JavaScript Example</title>
</head>
<body>
<script type="text/javascript">
var dateObj = new Date('26, September, 1989 4:25');
dateObj.setSeconds(55);
document.write(dateObj.toString());
</script>
</body>
</html>Output
Tue Sep 26 1989 04:25:55 GMT+0530 (India Standard Time)
Example
In the same way, though you do not pass any value to the constructor while creating the date object still you can set the seconds using this function and the month, date, year and, other values remain same as in the current date (and time).
<html> <head> <title>JavaScript Example</title> </head> <body> <script type="text/javascript"> var dateObj = new Date(); dateObj.setSeconds(55); document.write(dateObj.toString()); </script> </body> </html>
Output
Thu Oct 18 2018 18:44:55 GMT+0530 (India Standard Time)