Currently the system allows the author to assign a due date measured in days. However; some trainings are best provided when it is relative to the environment that someone will encounter.
Example: Winter Walking Training. A course that provides best practices to avoid slips, trips and fall in winter conditions.
For this example, taking a winter walking training in July due to a count down of days instead of by a month, negates the effectiveness of this type of training.
Having and added option to assign a course by month would correct this.