Hi dimensionav,
Access interprets date values according to the local regional settings of the computer it is being run on but not for the SQL interpreter which "I believe" always uses "MM/DD/YYYY" format.
Best bet, IMHO, is to use the DateValue function in your code.
The DateValue function will interpret the date according to the local regional settings and pass the equivalent numerical value to the database (which is format independent).
eg.
UPDATE Table1 SET Table1.ExampleDate TO DateValue("dd/mm/yyyy")
If you need date and time then:
UPDATE Table1 SET Table1.ExampleDate TO DateValue("dd/mm/yyyy") + TimeValue("hh:mm:ss")