calculate time

function sHHMM2Num(sTime) {// convert time string formatted as HH:MM to minutes // split value at ':' into and array of hours and minutesvar aTime = sTime.split(":");// convert hours element (hours from string) to minutesvar nMinutes = 60 * aTime[0] ; // add the minutes element (minutes from string) to nMinutesnMinutes = nMinutes + Number(aTime[1]); // return minutesreturn nMinutes;}  // get the start string from a variable, field value, or other sourcevar cStart = "01:30";// convert start time string to number of minutesvar nStart = sHHMM2Num(cStart); // get the interval string from a variable, field value, or other sourcevar cInterval = "01:30";// convert interval time string to number of minutesvar nInterval = sHHMM2Num(cInterval); // add the start time in minutes and the interval time in minutesvar nElapsed = nStart + nInterval;  // convert time in minutes to hoursvar nHours = nElapsed / 60;// truncate hours to whole hours onlynHours = Math.floor(nHours); // get the remainder of minutes from time divided by 60var nMinutes = nElapsed % 60; console.show();// display the resultsconsole.println(nHours + " hours and " + nMinutes + " minutes"); // some debugging informationconsole.println("cStart: " + cStart + " is " + nStart + " minutes");console.println("cInterval: " + cInterval + " is " + nInterval + " minutes");console.println("Elapsed time: " + nElapsed + " minutes");