General Information

Negative values take precedence over positive values when determining whether a mission is scheduled on a certain date. If a negative value (for example, 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 will not be scheduled on that date even if a positive value (for example, Ln) would otherwise result in the mission being scheduled on that date.

A maximum of eight values (for example, of types DnPi, –DnPi, LnPi, and –LnPi) can be designated in any desired order.

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

• 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 (for example, –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, –D*P*, –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.

The MONTHS parameter is ignored when periodic values are specified in the DAYS or WDAYS parameters.

The DAYS parameter cannot be used with the PDS, MINIMUM, and DATES parameters.