dateTime.setHours code example

Example 1: javascript make new date from hour

// Like Fri, 26 Sep 2014 18:30:00 GMT
var today = new Date();

var myToday = new Date(today.getFullYear(), today.getMonth(), today.getDate(), 0, 0, 0);

Example 2: new Date() get speicifc hours min sec

new Date().getDate()          // Get the day as a number (1-31)
new Date().getDay()           // Get the weekday as a number (0-6)
new Date().getFullYear()      // Get the four digit year (yyyy)
new Date().getHours()         // Get the hour (0-23)
new Date().getMilliseconds()  // Get the milliseconds (0-999)
new Date().getMinutes()       // Get the minutes (0-59)
new Date().getMonth()         // Get the month (0-11)
new Date().getSeconds()       // Get the seconds (0-59)
new Date().getTime()          // Get the time (milliseconds since January 1, 1970)