Javascript til at beregne tid mellem 2 tidspunkter

JScript kode 

 function TimeDiff(form) {
     
     var Time1 = new Date(form.start_tid.value);
     var Time2 = new Date(form.slut_tid.value);
     
     var DeltaHr  = Time1.getHours()   - Time2.getHours();    
     var DeltaMin = Time1.getMinutes() - Time2.getMinutes();   
     var DeltaSec = Time1.getSeconds() - Time2.getSeconds();   
     
     form.ialt_tid.value = DeltaHr + DeltaMin + DeltaSec;
 }

HTML kode 

 <form action="#" method="post">Vælg en start tid:
     <input type="time" name="start_tid" />Vælg en slut tid:
     <input type="time" name="slut_tid" />Tid ialt:
     <input type="text" name="ialt_tid" readonly="" />
     <input type="button" name="button" value="Click" onClick="TimeDiff(this.form)" />
 </form>