Write a bulletproof date validation routine.

[Neo]

Code:

IF year / 4 = INT(year / 4) THEN

Dark Ninja, your code for testing whether a year is a leap year is incorrect. The definition of a leap year (they added something to it, but I can't remember what) is:
Leapyear
#1. Factor of 4
#2. Not a factor of 100
#3. Rule 2 drops if year is factor of 400

So, the proper code would be:

Code:

LeapYear = ((Year MOD 4 = 0 AND Year MOD 100 <> 0) OR (Year MOD 400 = 0))
IF LeapYear THEN blablabla

Hope you can do something with it

EDIT:
Oh and:

Code:

IF day < 28 OR

Why are days lower than 28 invalid? :lol: That means your program will output 20000101 (1st Jan. 2000) as an invalid date.