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Unlike hosts and scripts, schedules are part of a task, not separate entities that are simply referred to by tasks.A schedule specifies both the days a task should run and the times it should run.
Specified days can be either days of the week (Sunday, Monday, Tuesday, etc.), days of the month (1-28), or a pre-configured Date List. Days of the week and days of the month can only be positively added to a schedule; you can not tell a schedule NOT to run on a day of the week or month. Date Lists can be added to a schedule either positively or negatively; a date list can either tell Central to run a task on the specified days, or not run a task on the specified days. A negatively added date list will overrule all other days in the schedule.
Times are expressed either as one specific time of day, or a range: every X minutes between two times of the day.
For example, specifying "Monday and Tuesday", and "Every 30 minutes between 3:00PM and 4:00PM" means that the task will run every Monday at 3:00PM, 3:30PM, and 4:00PM, and every Tuesday at 3:00PM, 3:30PM, and 4:00PM.
If you want a task to run at two dissimilar times, for example, Mondays at 8:00AM and Thursdays at 11:00AM, two separate schedules will be required, one for each day.