Automatic calendar in text boxes when month is selected

OK, create a Drop-down field with all the month names (and a default value, something like "Select Month"), and 31 text fields called "Day.1", "Day.2", etc.

Then use this code as the custom Validation script of the drop-down (you'll need to adjust the first two arrays to have the correct day and month names to match the ones you're using):

var days = ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"];
var months = ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"];

for (var i=1; i<=31; i++) this.getField("Day."+i).value = "";
if (event.value!=event.target.defaultValue) {
	var monthIndex = months.indexOf(event.value);
	var d = util.scand("m/d/yyyy", (monthIndex+1) + "/1/" + new Date().getFullYear());
	while (d.getMonth()==monthIndex) {
		this.getField("Day."+d.getDate()).value = d.getDate() + " - " + days[d.getDay()];
		d.setDate(d.getDate()+1);
	}
}