When creating a Weekly, Monthly or Yearly maintenance schedule in Spectrum, if you change the Start Date, check the Weekly, Monthly or Yearly check box and then click the OK button, the following error is seen: "Start date must be a scheduled day"
As we are defining a Monthly schedule, it would make sense to leave the Start Date time untouched.
But if we want the schedule to be active starting from the next month (for example: if we create a schedule for last Saturday of the month, and we do not specify a Start Date, then this schedule will be active also on the last Saturday of the current month), then will need specify a Start Date of the first day of the month we want the schedule to start.
If we set the second day or any day of the month other than the first, it will fail with that error message.