Add Custom Tasks to your Daily Task List:
Custom fields that have a field type of 'Date' can optionally be displayed in your Daily Task List. For example, if you would like to create a new field for 'Next Order Date', that reminder can be added to your Daily Task List on your specified date.
Go to the Profile Settings page, to enable the Custom Field with a 'Date' type to be displayed on the Daily Task List.
Set 'Automatically add contacts to the Daily Task List on this date' to 'Yes'.
Custom fields configured in Profile Settings, and with a date on the Contact record, will be displayed on the Daily Task List. Look for a Flag icon next to the activity reminder.