You don't need any datetime arithmatic at all. Just loop endlessly and check once a minute wether the lamp state matches the daytime.
use feature 'signatures';
my $on = 0;
sub switch_lamps ($switch_to) {
state $lamp_state = 0;
return if $lamp_state == $switch_to;
$lamp_state = $switch_to;
# ...
}
sub is_nighttime {
#...
}
while (1) {
switch_lamps( $on && is_nighttime() );
sleep(60);
}
holli
You can lead your users to water, but alas, you cannot drown them.
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