Months * Days of the month * Days of the week * Hours 0 Minutes 5
This setup would run a process every day, at five minutes past midnight.
Months * Days of the month * Days of the week 0,3,6 Hours 2 Minutes 10
This setup would run a process on every Sunday, Wednesday, and Saturday, at 2:10 a.m.
Months * Days of the month 1,15,31 Days of the week 2 Hours 1 Minutes 10
This setup would run a process during every month, on the 1st, 15th and 31st, and on every Tuesday, at 1:10 a.m. Obviously, you'll probably never need to schedule a job like this, but the example illustrates how the days of the month and days of the week fields are combined, if neither field is *.