Allow user to set the date for beginning/ending counting days of school, so planbook can include PD/workdays before first day of teaching.
Uncouple link between planbook start date and school days counter. Create independent field where user enters date for 1st of school and last date of school. Counter then uses those dates to calculate what day of school. Also, "days off" marker continues to prevent counter from being advanced.
Closed due to lack of community support.