Converts a screen name or e-mail address to a user value. A "user" is an individual with whom you've shared your application. You'd translate something like an e-mail address into a user value so that QuickBase recognizes the user. When you do so, you can take advantage of user fields to design permissions and/or views. For example, show a user only those tasks that have been assigned to her.
Date/Time type fields have a date, time and time zone associated with them, while Dates do not have time and time zone. This function converts the Date/Time x into a Date by returning the Date, in the local time zone, in which Date/Time x falls.