title: How to calculate difference between two times?
body: <p>I have two textboxes that allow a user to enter a start time and an end time in this format (h:mm). I want it to return the difference in a label. For example, if a user enters 1:35 in the first textbox and 3:30 in the second textbox and press the 'Calculate' button, it will return the time 1:55.</p>
  
  <p>Any ideas or resources for this? I only want to calculate the hour and minute difference between two textboxes. Date and seconds doesn't matter at all.</p>