Date Format
Date Format is determined by the system and Windows allows dd-MMM-yy where the Month is an abbreviation of the month name such as 31-Oct-24 for this Halloween.
BigBusiness 15 is adding support for this format and includes entering dates this way.
Date Entry
BigBusiness follows the Date Format on your computer and lets you enter and display dates in the same order, such as mm/dd/yy, which you can type with or without / or ..