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file=$1
if [ -f $file.gz ]
then command="gunzip -c"
else command=cat
fi
$command $file | awk -F"[/ ]" -v S="24/01/2013 10:10" -v E="24/01/2013 10:30" '
function dcmp(b) {
...

You miss the closing ' at the very end!
An exercise:
echo '
this
is
a
multiline
string'

And
echo '
line1
line2' > newfile

if [ -f $file.gz ]
then command="gunzip -c"
else command=cat
fi1. You do want to test for $file.gz, don't you.
2. The shell [ ] wants a space on both sides. If you like you can...

On traditional Unix zcat is linked to the traditional uncompress rather than gunzip.
In this case replace zcat with gunzip -c.

Any sh-compatible shell will do it, because it does nothing than passing a multi-line 'string' to awk. But the awk version matters!
Surprisingly, Solaris nawk does not handle expr{dig,dig}.
Here...

Amazing!
Your code works with Posix-compatible GNU awk and HP-UX awk.
Somehow Solaris nawk does not work (prints nothing),
and Solaris Posix /usr/xpg4/bin/awk wants correct arguments:
-v S="..."...