Comparing two time variables with jquery

Question

This is my jQuery code. In this code #StartTime and #EndTime is form input tag id's.

The getting time format is 00:00 AM/PM.

The var starttimeval and endtimeval contain values of getting start and end time.

How do I compare these two times, example: if(starttimeval < endtimeval){alert(message);}

  $(function() {
    $('#StartTime').datetimepicker({
        datepicker : false,
        format : 'g:i A'
    });
    $('#EndTime').datetimepicker({
        datepicker : false,
        format : 'g:i A'

    });
     var starttimeval=  $("#StartTime").val();
     var endtimeval= $("#EndTime").val();

      });

i want only time compare functionality. example getting value of starttimeval=8:00 PM and endtimeval=9:00 AM

Answer 1

Well, have you tried something like this :

var dateBegin = $('StartTime').datepicker('getDate').getTime():
var dateEnd = $('EndTime').datepicker('getDate').getTime();
if (dateBegin == dateEnd)
   // some stuff

Seen in the doc. (I assume you are using datetimepicker from jquery ui)

Answer 2

Try this:

  var start=$("#StartTime").val();
  var starttimeval= start.split("/");
  var startdt= new Date(starttimeval[2], starttimeval[1] - 1, starttimeval[0],starttimeval[3],starttimeval[4]);

  var end=$("#StartTime").val();
  var endtimeval= end.split("/");
  var enddt= new Date(endtimeval[2], endtimeval[1] - 1, endtimeval[0],endtimeval[3],endtimeval[4]);

  if (startdt< enddt) {
    alert("startdt is before current date");
  }else{
    alert("startdtis after current date");
  }

Answer 3

Getting values from a form is going to return strings, best to convert/parse the strings into javascript Date objects and compare that

var starttime = new Date("April 14, 2014 11:00 PM");
var endtime = new Date("April 15, 2014 1:00 AM");

FIDDLE

Whenever you start dealing with date/time comparisons and your first thought is to start parsing strings and adding if conditions to test for various conditions like spanning midnight....stop, just stop.

Working with dates and times is best left to established code, no need to re-invent the wheel.