You can set section start date under the
Starts heading. The
On the day of enrollment setting is used for continuous enrollment situations such as self-paced students in a continuing education program, this will allow your student to use the section (or class) from the date of enrollment.

Figure 2.5: Setup Page with Starts Heading OptionChoosing the
Fixed Start option will allow you to set your section start date with the help of a calendar.