i've done this code, i want to obtain an effettive time of work, for example
MI = morning start 8:00
MF = mordining end 12:00
OreLavorate result is 4:00
but in this code i obtain only numer not time of work
var x = document.editform.value_Pausa;
x.onchange = x.onkeyup = function() {
var MI = document.editform.value_MattinoInizio.value;
var MF = document.editform.value_MattinoFine.value;
var PI = document.editform.value_PomeriggioInizio.value;
var PF = document.editform.value_PomeriggioFine.value;
var PP = document.editform.value_Pausa.value;
document.editform.value_OreLavorate.value = MF - MI;
document.forms.editform.value_Orelavorate.disabled=true;
}