Calender..

Hi, i'am programming a calender. But a problem has come up.
In my calender i can search for a specific year, from 1900 and forward. And i have to write month and day. And then it says what day that date were. The problem is that i can't go 1900 and backward, when i search for a date (ex. 1899) and write the month and day (in integer). And it says: That day were a Illegal day (When it should say the dayname)
Leap year must include.
Someone please help me?

Have a nice day! //Henrik

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