Filemaker Pro Error on formatting date

Hi guys,
I am have a scenario here about Filemaker Pro when ever I entered and date format, an error message will appear and ask me to change the date format.
I pasted below the screen shot of the error.
The value of this field must be a valid
date in the range of years 1 to 4000 and
should look like “12/25/2003”.
The above error message is telling me that the format of date I am entering is invalid, OK I understand I made a mistake in entering the date the date format that I entered is our format of date that I must use it, rather than the default of Filemaker Pro please help me change the date format of Filemaker Pro, so that it will conform to our standard,
Thanks a lot.
