#reset dummy scoreboards, dummy2's value is essentially 'skip the day progression every X days'
scoreboard players set @s KyuDummy -50
scoreboard players set @s KyuDummy2 2


#set dummy1 scoreboard to the current day, then divide it by dummy2's scoreboard value as set above and set it as the remainder
scoreboard players operation @s KyuDummy = @s DayQ2
scoreboard players operation @s KyuDummy %= @s KyuDummy2

#if the remainder is 1, do day progression
execute as @s[scores={KyuDummy=1}] run function zzzzdonotuse:daytimer/daytext