What is the purpose of command NRDAY in CA-7

What is the purpose of command NRDAY in CA-7

Hi,

Im new to CA7 schedular. When im preparing job scheduing doc i came accors the command NRDAY=-01. Could anyone explanin what id does if we use this command. Im giving whole command below.

ID=131 ROLL=D INDEX=+000 SCAL= DOTM=2310 LEADTM=0010 SUNTM=2330 STARTTM=2300 MONTHLY DAY=MON WEEK=-00 MONTH=ALL MONTHLY NRDAY=-01 MONTH=ALL MONTHLY NRDAY=-02 MONTH=ALL MONTHLY NRDAY=-03 MONTH=ALL MONTHLY NRDAY=-04 MONTH=ALL MONTHLY NRDAY=-05 MONTH=ALL

MONTHLY NRDAY=-06 MONTH=ALL