Is there someone out there than can help with javascript in a fillable form in acrobat?

I have downloaded the calendar picker from FormRouter and see that the August 31 missing date has been fixe.

You script will require custom JavaScript coding and that means knowing each field name and format so that information can be used in the script to get each needed field object and the values of the objects as needed.

The basic steps are to get the form field objects and then the values of the fields.

To get the date object to modify one needs to convert the data string concatenated with the time string into a date object using the util.scand() method.

Now one needs to get the number of hours for the time off and convert value into the parts of hours and minutes.

Now one can adjust the date object's hours by the number of hours and the minutes by the number of minutes.

The date object will now have the start time adjusted by requested number of hours.

You can use the util.printd method to format the adjusted date object into a formatted date and time string.

This is not a beginners task.

Sample code:

function GetField(oDoc, cName) {
// get field object with error checking;
var oField = oDoc.getField(cName);
if(oField == null) {
app.alert("Invalid field name: " + cName, 1, 0);
}
return oField;
} // end GetField fucntion;

function Scand(cFormat, cValue) {
// convert date time string into date object with error checking;
var oDate = util.scand(cFormat, cValue);
if(oDate == null) {
app.alert("Error in converting date string " + cValue + " with format " + cFormat + " into a date object", 1, 0);
}
return oDate;
} // end Scand funciton;

var cStartDate = "02/29/2016";
var cStartTime = "11:30 pm";
var cTimeOff = "7:30";
// get the start date and time field objects values; // used if getting field value;
// var cStartDate = = GetField(this, "StartDate").value; // used if getting fiel value;
// var cStartTme = GetField(this, "StartTime").value;
var cStartDate = "02/29/2016"; // force to string variable;
var cStartTime = "11:30 pm"; // force to string variable;
// create date time object for input values;
var oDate = Scand("mm/dd/yyyy h:MMtt", cStartDate + " " + cStartTime);
// get requested time off value;
// code to get field value and convert the value to hours and decimal hours;
var cTimeOff = 7.5; // force to numeric value;
// adjust date object for requested time off value;
oDate.setHours(oDate.getHours() + cTimeOff);
// report ending value for time off;
var cEndTimeOff = util.printd("m/d/yyyy h:MM tt", oDate);
app.alert("Time off ends: " + cEndTimeOff, 3, 0);