The comma must be replaced by a space to feed @ARGV. Running the command as you did (with warnings produced this.

C:\Old_Data\perlp>perl -we "print( ($ARGV[1] - $ARGV[0])%24 <=8)" 22,0
+2
Argument "22,02" isn't numeric in subtraction (-) at -e line 1.
Use of uninitialized value in subtraction (-) at -e line 1.
1
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With a space instead of comma it produced:

C:\Old_Data\perlp>perl -we "print( ($ARGV[1] - $ARGV[0])%24 <=8)" 22 0
+2
1
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To get the actual hours difference, remove the <= 8 test.

C:\Old_Data\perlp>perl -e "print( ($ARGV[1] - $ARGV[0])%24)" 22 02
4
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