1. Create an Excel table (Insert, Table).
2. Fill in the data.
To get the today list, filter the table using the DueDate column.
Excel has multiple ways to filter date data.
Look also at the SaveToDB add-in for Excel at http://www.savetodb.com
It allows keeping your data in a database and editing the database data from multiple workbooks.
Even you do not want to use a database, try table views supported by the add-in.
You may save multiple Excel auto-filter views and apply them just in a one click.