Since each date is really just a number stored in Excel, to compute the midpoint of two dates you would use the same mathematical formulas you would use to calculate the midpoint of two numbers ...

You can create and set the trigger for an alarm in MS Excel by creating a VBA module. Learn how to Ring an Alarm in Microsoft Excel.

The Excel software allows you to use the VBA coding language to create macros and automated services. You can create a macro in the VBA editor to send an email and set a reminder.

Using Excel as a scheduling tool is a great skill to have under your belt. Learn how to use SUM, DATE, WEEKDAY, IF, Nested IF, and IF/OR functions.