What message do you get in your server error log?
What you show will work if used properly [Oops, not quite - Paladin++ caught a true error]. You're not showing exactly how you get $day or what happens if a value for an undefined key is read from the hash.
With a numerical sequence of keys, an array may be more natural than a hash for that. One of the many time string utilities may be better yet. I like,
use POSIX 'strftime';
my $dayname = strftime '%A', localtime;
That will honor locale, so anybody can run your script and get the day named in their own language.
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