How to Compare dates

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Hello sir,

I made this script that if one enter Starttime is 9:30 and end time is 10:30 then nobody would able to enter 9:45 in another textbox

HTML

<script type="text/javascript" language="javascript">
    function CompareTime() {
        var Time = new Array();
        Time[1] = "StartTime";
        Time[2] = "EndTime";
        Time[4] = "EnterTime";
        Time[3] = Time[2] - Time[1];
        if (Time[1] < Time[4] && Time[4] < Time[2] - Invalid) {
            document.write("This is Correct Time");
        }
        else {
            document.write("This is Wrong Time");
        }
    }
</script>

Please hint what I m doing wrong

Invalid is Keyword

Posted 10-Nov-11 19:52pm

Prashant Srivastava LKO

Updated 10-Nov-11 19:53pm

Mehdi Gholam

v2

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Sergey Alexandrovich Kryukov · Answer 1 · 2011-11-10T20:33:00

Just use the operators "==", "<", ">", "<=", ">=" (the meaning of them is "natural") and "-". The last one needs explanation: it returns the value of the structure System.TimeSpan, a duration between time points which can be zero, negative or positive. This type can return duration values in fractional measure and in whole units, in a lot of different time units, please see http://msdn.microsoft.com/en-us/library/system.timespan.aspx[^].

For more detail, see http://msdn.microsoft.com/en-us/library/system.datetime.aspx[^].

—SA

koolprasad2003 · Answer 2 · 2011-11-10T19:58:00

Do not compare time like common string, it could produce wrong result. here is example

JavaScript

var start = "01:00 PM";
var end = "11:00 AM";
var dtStart = new Date("1/1/2007 " + start);
var dtEnd = new Date("1/1/2007 " + end);
var difference_in_milliseconds = dtEnd - dtStart;
if (difference_in_milliseconds < 0)
{
alert("End date is before start date!");
}

How to Compare dates

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