There are problems entering some forms of February 29, 2000.  The following entries will produce an '...is not a valid date' error message:

• 2/29
• 02/29
• 02/29/00
• 2.29
• 02.29
• 02.29.00
• 2-29
• 02-29
• 02-29-00
• 0229
• 022900

The following entries will not produce and error and should be used when entering this date:

• 2/29/00
• 2/29/2000
• 2.29.00
• 2.29.2000
• 2-29-00
• 2-29-2000
• 02292000
• a date with day, month, or year modifiers, e.g. entering 91d on 11/30/99.