like
on:start
day$==1
on:changeday
day$++
if day$==7
day$==1
and in some item you can put that it shows day$ like
if day$==1
msg "Its Monday"
and as for month you can use it like this
on:start
month$==1
monthname$==1
on:changeday
month$++
if month$==30
then set month==1
and monthname$++
if monthname$==4
then set it to 1
For more info contact me