Open a new workbook and develop a form that asks for a beginning date and an ending date in text boxes. It should instruct the user (with an appropriate label) to enter dates from January 1, 1990, to the current date. Create a Valid function to perform the following error checks: (1) the date boxes should not be blank; (2) they should contain valid dates (use the Is Date function for this); (3) the first date shouldn’t be before January 1, 1990; (4) the last date shouldn’t be after the current date (use the Date function for this—it returns the current date); and (5) the first date should be before the last date. If any one of these error checks is not passed, the form should not be hidden, and the focus should be set to the offending text box so that the user can try again. If all error checks are passed, the dates should be displayed in an appropriate message box, such as “You chose the dates 1/1/2000 and 2/2/2002.”
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