RE: How to change a Report Layout date format
Changing the format of the Date/Time Format in Inbox
Click on the View tab.
Then click View Settings.
In the Advanced View Settings dialog box, click Format Columns
In Available Fields on the left highlight Received
From the Format drop-down menu (click the down arrow to the right of the format field), then select how you want it displayed. In the below example the format selected would display date and time.
Click OK
Then Click OK again on the Advanced View Settings dialog box.