Hi,

You might have defined the following line outside the if statement,

rec.day_of_week = week_day.strftime("%A").title()

If the value for the rec.exam_date field is not there, the value for the variable week_day is not assigned/defined. Then outside the if statement you are accessing the same undefined the variable, thus you get this error.

You can update your code like this,

if rec.exam_date:

    week_day = datetime.strptime(rec.exam_date, "%Y-%m-%d")

    if week_day:

        rec.day_of_week = week_day.strftime("%A").title()

Thanks