Well first off you have your string mixed up, month comes
before date. So that should be
var isToday:String = thisDate.getMonth().toString() + "/" +
thisDate.getDate().toString() + "/" +
Then the second thing to take note of is something straight
out of the live docs with the month.
month : Number
The month (0 for January, 1 for February, and so on) portion
of a Date object according to local time.
They start at 0 not 1. So you have two options either always
add one to the month for the correct month if showing the number
like that or format the date using a DateFormatter before you alert
it. Which could be done like so.
var df:DateFormatter = new DateFormatter();
df.formatString = "MM/DD/YYYY";
Alert.show(df.format(new Date()), "Full Date");