Settings > Settings Window - Company > Settings Window - Company > Date Format > Change the Format You Use for Long or Short Dates

Change the Format You Use for Long or Short Dates

To change the format of long or short dates for your company:

In the Home window, on the Setup menu, select Settings.
Open Company, and select Date Format.
Select a Date Format for Short or Long dates.
Select a Date Separator for Short or Long dates
Click OK.

Note: You can also change the date format used on screen or in reports.