Continuing the previous exercise, it might take you several tries to get everything, especially the error checking, working properly. Dates are tricky! Once you go to all of this work, you shouldn’t have to do it again. The purpose of this exercise, therefore, is to write a Public Boolean function called Valid Date that does the error checking for this type of situation automatically. You could then use this general sub any time you need it in the future. Structure it as follows. It should take four arguments: txtDate1 (a text box for the first date), txtDate2 (a text box for the second date), earliest Date (a Date variable, corresponding to the January 1, 1990 date in the previous exercise), latest Date (a Date variable corresponding to the current date in the previous exercise). This sub should check for all errors. If it finds any, it should set the focus to the offending text box and set Valid Date to False. Otherwise, it should set Valid Date to True. Write this Valid Date function, which should be placed in a module, and then use it to solve the previous exercise. (Hint: The code in this exercise will be very similar to the code in the previous exercise. However, the Valid Date function is now in a module, and there is no Valid function in the form code. This presents some interesting problems on how to pass variables, and you can decide the best way to do it—preferably without global variables. Also, if you try to make a Text Box control the argument of a function in a module, you can’t just type something like txtDate1 As Text Box. You must also include a reference to the library that has information about text boxes. Therefore you must type txtDate1 As MS Forms. Text Box. You learn such details through extensive trial and error.)
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