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Here's your awk command included in a bash script

#!/bin/bash
echo "Printing from line $1 to line $2"
awk "NR>$1&&NR<$2 {print \$0}" $3

Here's a simple shell script that will generate the same output that
your awk command would produce:

#!/bin/bash
echo "Login time for $1:"
w | grep $1 | awk '{print $4}'


Save that text...

cat /dev/null > file.txt

If I run the following in march I get 12:

% date -d"3 months ago" "+%m"
12

So, I suppose so your command will work for you

The compiler doesn't know what size the structure 'timezone' is.

Have you included sys/time.h ?