perl script help

[JJB]

I need $timezone to hold the time zone in this format  -00:00
The command  date +%z  will give it as  -0000

I know nothing about writing perl scripts.

Can somebody show me how to  add the : in the output 
of the date command in the simple following script?

The cat statement is just so I can see results are correct.


#!/usr/bin/perl
$timezone=date +%z;
cat $timezone