WHMCS can display dates in several different formats, and you can configure display for admins and clients separately.
Change Date Formats
To configure the date format:
- Go to Configuration > System Settings > General Settings (prior to WHMCS 8.0, Setup > General Settings).
- Select the Localisation tab.
- For Date Format, choose the desired date format for the Admin Area.
- For Client Date Format, choose the desired date format for the Client Area and your store.
Choose Same as Admin (Above) to always show dates to clients and admins in the same format.