Since the HEAT 2015.1 upgrade, date fields are included within notifications.
Launch the application
Open the Request Offering workspace
Select and open the appropriate request offering
Verify the name of the date field
In the notification block of the workflow, change the $(GetSRPValue(RecId, "date_1")) to $(FormatDate(GetSRPValue(RecId, "date_1"), "MM/dd/yyyy")) **Note: "date_1" is the unique identifier for the field.
Save and Exit
Repeat these steps in any Request Offering/Notification block containing date field you wish to format