Basic Validation in Date Time using JavaScript

Basic Validation in Date Time using JavaScript

var StartTime = $("select[title='StartTime'] option:selected").val();
var EndTime = $("select[title='EndTime'] option:selected").val();
var date = $('input[title="ReserveDate"]').val();


//convert both time into timestamp
var stt = new Date(date  + start_time);
stt = stt.getTime();

var endt = new Date(date  + end_time);
endt = endt.getTime();

//by this you can see time stamp value in console via firebug
console.log("Time1: "+ stt + " Time2: " + endt);

if(stt > endt) {
alert("time");
}


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 var stt = parseInt($("select[title='StartTime'] option:selected").val().replace(':', ''), 10);
alert(stt);

var ett = parseInt(EndTime .replace(':', ''), 10);
alert(ett);

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var StartTime = $("select[title='StartTime'] option:selected").val();
var EndTime = $("select[title='EndTime'] option:selected").val();
var time1_higher_than_time2 = compareTime(StartTime , EndTime);
if(time1_higher_than_time2) alert("Time1 is higher than time 2");
else alert("Time1 is not higher than time 2. ");

function compareTime(StartTime, EndTime){
    var re = /^([012]?\d):([0-6]?\d)\s*(a|p)m$/i;
    StartTime = StartTime.match(re);
    EndTime = EndTime.match(re);
    if(StartTime && EndTime){
        var is_pm1 = /p/i.test(StartTime[3]) ? 12 : 0;
        var hour1 = (StartTime[1]*1 + is_pm1) % 12;
        var is_pm2 = /p/i.test(EndTime[3]) ? 12 : 0;
        var hour2 = (EndTime[1]*1 + is_pm2) % 12;
        if(hour1 != hour2) return hour1 > hour2;

        var minute1 = StartTime[2]*1;
        var minute2 = EndTime[2]*1;
        return minute1 > minute2;
    }

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  var start_time = Date.parse(StartTime, "hh:mm tt");  //Convert Time from A/PM to time
                var end_time = Date.parse(EndTime, "hh:mm tt"); //Convert Time from A/PM to time

                var startDate = new Date("1/1/1900 " + start_time);
                var endDate = new Date("1/1/1900 " + end_time);
                var difftime = end_time - start_time;


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 if(is_pm1 == 12)
        {
        hour1 = hour1 - 12;
        }
        var is_pm2 = /P/i.test(TestendTime [3]) ? 12 : 0;
        alert(is_pm2);
       
        var hour2 = ((TestendTime [1]*1) + is_pm2) ;
     
        alert(hour2);
        if(is_pm2 == 12)
        {
        hour2 = hour2 - 12;
        }
        alert(hour1 );
        alert(hour2);
        if(hour1==12) hour1=0;
          if(hour2 == 12) hour1=0;
        if(hour1 != hour2)
        {
         if(hour1 > hour2)
         {
         alert("Your StartTime is later than your End Time. Please change either the Start or End Time");
         return false;
         }
        }
        else if(minute1 == minute2)               
        {
            alert("Your Start Time is equal to your End Time. Please change the Start Time or End Time");
            return false;
        }


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References:

http://forums.asp.net/t/1289294.aspx?TimeSpan+Years+and+Months

http://stackoverflow.com/questions/4638993/difference-in-months-between-two-dates


DATETIME IN JQUERY
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<script type="text/javascript">
$(document).ready(function() {
   var currentdate = new Date();
   var h=currentdate.getHours();
   if (h >= 12) {
        h = h-12;
        dd = "PM";
    }
    if (h == 0) {
        h = 12;
    }

    var ampm=h >= 12 ? 'PM' : 'AM';
var datetime = "at: " +(currentdate.getMonth()+1  + "/"
            + currentdate.getDate()  + "/"
            + currentdate.getFullYear() + " on " + (h<10 ? '0' : '') +
            + h + ":" 
            + currentdate.getMinutes()+ ampm);
          

                   alert(datetime );
});
</script>