The date format in the helpdesk app is tightened to the app's language setting.
If you need to change date to "dd/mm/yyyy" while keeping the language - simply change the language from "en-US" to "en-GB" in the settings ("Administrator - General settings")
Jitbit Helpdesk ticketing system is our flagship product. Its a great helpdesk software app offered both as a hosted and "on-premise" versions.