javascript - How to compute the difference between 2 time in jquery datetimepicker? -

i'm using jquery datetimepicker, want difference between start time , end time.

how can calculate using javascript/jquery code?

i set start , end time in html like.

<div class='input-group date' id='time_starts_at'>   <input class="form-control" placeholder="time start's @ *" autocomplete="off" type="text" name="" id="calendar_starts_at_time">   <span class="input-group-addon">     <span class="glyphicon glyphicon-time"></span>   </span> </div>  <div class='input-group date' id='time_ends_at'>   <input class="form-control" placeholder="time end's @ *" autocomplete="off" type="text" name="" id="calendar_ends_at_time">   <span class="input-group-addon">       <span class="glyphicon glyphicon-time"></span>   </span> </div> 

and, jquery codes getting value:

var timefrom = $start_time.data('date'); var timeto = $end_time.data('date'); 

curently, i'm doing manually splitting hour , minutes. adding validation on checking values before subtracting it.

is there best way ?

please help. thank you.

solved

thanks @felix kling, how calculate time difference between strings in javascript

function toseconds(time_str) {     // extract hours, minutes , seconds     var parts = time_str.split(':');     // compute  , return total seconds     return parts[0] * 3600 + // hour has 3600 seconds     parts[1] * 60; // minute has 60 seconds }  var = "10:55" //start time var b = "12:00" // end time  var difference = math.abs(toseconds(a) - toseconds(b));  // format time difference var result = [     math.floor(difference / 3600), // hour has 3600 seconds     math.floor((difference % 3600) / 60), // minute has 60 seconds     difference % 60 ]; // 0 padding , concatation result = result.map(function(v) {     return v < 10 ? '0' + v : v; }).join(':'); alert(result);