day="2022-06-16";

echo $day

y=`echo ${day} | cut -d- -f1`
m=`echo ${day} | cut -d- -f2`
d=`echo ${day} | cut -d- -f3`
echo $y $m $d

-----------------------------------
[kondo@lxplus720]~/shell% source cut.sh
2022-06-16
2022 06 16