You can highlight a column and right-click Properties. At the bottom section of the dialog you will see Format and Display. In the format section you can set it to either date or time. In the display section you can set how your date or time is displayed. To combine them, just add the date and time together in another column and set the column to be Date with display format to show both date and time. See the attached image of how column A is set. Need to do a similar thing for column B.