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-v declares a variable to use inside awk. You could also put that at the end, without -v. e.g.

awk -vd=`date +%Y%m%d` -F"," '{print $1, d}' OFS="," file

What is wrong with the result ("didn't get the result as expected)?

$ sed "s/$/,$(date '+%Y%m%d')/" file
22055,20180930
21088,20180930
93840,20180930
30990,20180930
50990,20180930...