Question

I want to validate start time and end time selected using timepicker which is in 12 hr format. The end time should be greater than the start time. I used an if statement but when the test is using values such as 8:00 AM as start time and 1:00 PM as end time, it is not working. What can I do to solve this problem. Someone please help me with this. I am stuck with this since yesterday. I want just time ,i don’t need date.

$("#dateTimeAddButton").click(function () 
{       
    var Date=$('#myDatePickerId').val()
    var startTime = $('#i').val();   
    var endTime   = $('#i1').val();    
    if (startTime > endTime) 
    {
        alert('End time always greater then start time.');
    }
});

Answer 1

First convert to lowest denominational (minute here). Then compare it.

st = minFromMidnight(startTime);
et = minFromMidnight(endTime);
if(st>et){
    alert("End time must be greater than start time");
}

function minFromMidnight(tm){
 var ampm= tm.substr(-2)
 var clk = tm.substr(0, 5);
 var m  = parseInt(clk.match(/\d+$/)[0], 10);
 var h  = parseInt(clk.match(/^\d+/)[0], 10);
 h += (ampm.match(/pm/i))? 12: 0;
 return h*60+m;
}