It looks to me like there is a mistake in the Leap Year Program:
if ((year % 400 == 0) || (year % 4 == 0 && year % 100 == 0))
should probably read
if ((year % 400 == 0) || (year % 4 == 0 && year % 100 != 0))
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It looks to me like there is a mistake in the Leap Year Program:
should probably read