How to change date format

hi team here I am using manager version 18.10.73. date format has been change in this version there is date format MM/DD/YYYY. but in the earlier version the date format was DD/MM/YYYY.
actual problem is that our previous invoices are in dd/mm/yyyy so now I want to change the date format. can you suggest me that how can I do that from my side??

See here

Just go to Preferences tab and select your desired date format.