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Longhand using CygWin default bash terminal:-

(Note I have not bothered to remove the leading newline as that is easy.)
#!/bin/bash
> /tmp/comment
> /tmp/nocomments
ifs_str="$IFS"...

$ awk 'gsub(/\/\*.*\*\//,x) + 1' curve.csv

Here is a generalized approach for sunday:
cal 5 2013 | /usr/xpg4/bin/awk -v n=2 'NR>2&&!/^ /{if(++c==n) {print $1;exit}}'
Change n variable value as per your requirement.

cal 5 2013 | awk 'NF==7&&NR>2{print $1;exit}'

Try ..

cal 12 2012 | awk 'NF==7 && !/^Su/{print $1;exit}'

This gives 9 which is 2 Saturday.

March 2013
Su Mo Tu We Th Fr Sa
1 2
3 4 5 6 7 8 9
10 11 12 13 14 15 16
17 18 19 20 21 22 23
24 25 26 27 28 29 30
31

Script...

cal -m 03 $i_year | awk 'NR==4{print $NF}'