The date picker, besides entering a date, can undo up to 20 entries can append dates to existing cell text, can insert a month or year calendar. It is coded for 32/64 bit, but I have no feedback re 64 bit.
MICROSOFT MONTHVIEW CONTROL 6.0 SP6 DOWNLOAD 64 BIT
2) Copy WinDatePicker.xlam to a unprotected directory on your system.