Negative values take precedence over positive values when determining whether or not a mission is scheduled on a certain date. If a negative value (such as format –n, –Dn, –Ln, –DnPi, or –LnPi) in either the DAYS or WDAYS field prevents a mission from being scheduled on a date, the mission is not scheduled on that date even if a positive value (such as Ln) would otherwise result in the mission being scheduled on that date.
A maximum of eight periodic values (such as types DnPi, –DnPi, LnPi, or –LnPi) can be specified in any desired order.
If periodic and non-periodic values are mixed when specifying parameter WDAYS, processing depends on the calendar type specified in parameter WCAL:
If a non-periodic calendar is specified in the WCAL parameter, only non-periodic values in the WDAYS parameter are processed; periodic values are ignored. In this case, negative periodic values (that is, –DnPi, –LnPi) are also ignored and do not supersede other values.
If a periodic calendar is specified in the WCAL parameter, all periodic values and the negative non-periodic value -n in the WDAYS parameter are processed; all nonnegative non-periodic values are ignored.
When Ln and/or Dn values are specified in a week which overlaps two months, the MONTHS value of the earlier month determines whether or not Dn or Ln values are applied in the week:
If the first day of the week falls in a month with a MONTHS value of Y, all Dn and Ln values in that week are applied, even those falling in the next or previous month when that month has a MONTHS value of N.
If the first day of the week falls in a month with a MONTHS value of N, no Dn or Ln values in that week are applied (not even if those falling in the next or previous month when that month has a MONTHS value of Y).
Parameter MONTHS is ignored when periodic values are specified in parameter WDAYS.
Parameter WDAYS cannot be used with parameters PDS and MINIMUM.
