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The simplest approach would be for there to be 3 fields with Y, M, D however if this isn't possible then you would need to first determine how you want it the user to enter the info. For example if you want them to enter 3 years, 7 months 45 Days what is the format you expect? Is it"
03, 07, 45 or 03-07-45 or even 03y, 07m, 45d?
Once you determine that, then you will need to use a regular expression to maintain the format. You will also need a warning if the format is not correct and remove the incorrect entry.
Below is a similar script I created for a formatted date field. You should be able to modify this for your format:
var myRegExp = /[0-1][0-9]\/[0-3][0-9]\/\d{4}/; // Created a regular expression for the date format
var myText = ExecFromDate.rawValue; //variable to store the field
if(ExecFromDate.rawValue == null){ //checking for empty field
ExecFromDate.rawValue = null;
}
else
if(myRegExp.test(myText)== false){ //validate input against regular expression
xfa.host.messageBox("You have entered an incorrect date format. Please use MM/DD/YYYY", "Date error", 3, 0); //warning if incorrect format
xfa.host.setFocus("ExecFromDate") //sets the user back to the date field
ExecFromDate.rawValue = "" //clears the entry
}