General Information

Negative values take precedence over positive values when determining whether or not a mission is scheduled on a certain date. If a negative value (that is, 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 (of type DnPi, –DnPi, LnPi, and –LnPi) can be designated in any desired order.

If periodic and non-periodic values are mixed when specifying parameter DAYS, processing depends on the calendar type specified in parameter DCAL:

• If a non-periodic calendar is specified in the DCAL parameter, only non-periodic values in the DAYS parameter are processed; periodic values are ignored. In this case, negative periodic values (such as –DnPi, –LnPi) are also ignored and do not supersede other values.
• If a periodic calendar is specified in the DCAL parameter, all periodic values and the negative non-periodic value -n in the DAYS parameter are processed; all other non-periodic values are ignored.

–D*Pi and –D*P*, and –L*Pi and –L*P* are not permitted, because these values would result in ordering the mission on no days in a period or no days in all periods, a meaningless request.

Parameter MONTHS is ignored when periodic values are specified in parameter DAYS or WDAYS.

Parameter DAYS cannot be used with parameters PDS, MINIMUM, and DATES.