When entering a birth date on a constituents record you may encounter this error message: Please enter a valid 'Birth date'.
This error message will occur when entering an invalid birth date on the constituent's record such as 13/1/2015. Make sure you're entering the correct month, date, and year when entering the birth date. Note: If you are entering a birthday that occurs on a leap year the full birth date must be entered.
Steps to Duplicate
Click Constituents > Constituent Search
Search for and Select a Constituent
Click on the Personal Info > Personal tab on the Constituent's record