Help creating time worked field on time sheet.

Question

I am new to acrobat. I am creating a time sheet submittable form. I have start time fields and end time fields and now i need a field that  calculates total time worked in hours. I could do this using military time except that in the calculations tab in field properties there is no subtraction calculaton option, just addition. Is there anyway to acomplish this by writing a script? I know nothing abiut writing scripts, PLEASE HELP.

Answer 1

You need to use JavaScript to write the custom JavaScript Code. You can convert the time string to a JS data object and do the math at milliseconds.
You can split the time string into hours and minutes, convert the hours to minutes and add to the minutes, do the math in minutes and finally convert the minutes back into hours and minutes.
Since you will be repeating the math for each day, I would look at creating a function to convert the time string cell to minutes for the computation.
There can be problems with leading zeros and no separator symbols since the Number format strips the leading zeros from number character strings.
function Time2Min(cTime){
var min = 0
var hr = 0
cTime = cTime.toLowerCase();
// civilian time
if (/(\d{0,2})[:](\d{2})[ ]?([ap])/.test(cTime)) {
   hr =  Number(RegExp.$1);
   if (RegExp.$3 == "p") {
      hr += 12;
   min = (60 * hr) + Number(RegExp.$2);
   } // end civilian time
// 24 hour time
if (/(\d{0,2})[:](\d{2})/.test(cTime)) {
   min = (60 * Number(RegExp.$1)) + Number(RegExp.$2);
   } // end 24hour time
// military time
if (/(\d{0,2})(\d{2})/.test(cTime)) {
   min = (60 * Number(RegExp.$1)) + Number(RegExp.$2);
   } // end military time
return min;
} // end function
function Min2HH:MM (nMinutes) {
return util.printf("%,1 01.0f" + ":" + "%,1 02.0f", Math.floor(nMinutes / 60), Math.floor(nMinutes % 60));
var elapsed = 0;
var sEnd = "1600"; // change for field value as string
var sStart = "0900" // change for field value as string
// add loop to go through fields:
if (sEnd != "" & sStart !="") {
elapsed += (Time2Min(sEnd)  - Time2Min(sStart)) ;
// end of loop
// format the output
Min2HH:MM(elapsed);