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Date.prototype.setHours() Method in Date Class of Javascript Syntax with Examples
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Usage 
The setHours() method is used to sets the hours for mentioned date based on local time.
Syntax 
dateObj.setHours(hoursValue)
Example
var today = new Date();
document.write("Today: "+today);
document.write("<br />");

today.setHours(today.getHours() - 1);
document.write("1 Hour Before: "+today);
Output 
Today: Sat Nov 29 2014 12:27:42 GMT+0530 (India Standard Time)
1 Hour Before: Sat Nov 29 2014 11:27:42 GMT+0530 (India Standard Time)
 
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