note
vagabonding electron
Aye-aye, sir! :-) <br>
<c>
#!/usr/bin/perl
use strict;
use warnings;
use DateTime;
use DateTime::Format::Strptime;
use Datetime::Set;
# use Data::Dumper;
my $strp = DateTime::Format::Strptime->new(
pattern => '%Y-%m-%d %T',
);
my $datf = qq{2012-01-01 04:00:00};
my $datt = qq{2012-01-02 23:00:00};
my $start = $strp->parse_datetime($datf);
my $end = $strp->parse_datetime($datt);
while( $start < $end ){
print "$start\n" if $start->hour > 6 and $start->hour < 23;
$start->add( hours => 1 );
}
</c>
I had bad luck with an attempt over <c>$set = DateTime::Set->from_recurrence</c> however.<br>
This one:
<c>
$set = DateTime::Set->from_recurrence(
after => $start,
before => $end,
recurrence => sub {
return $_[0]->truncate( to => 'day' )->add( hours => 1 )
},
);
my $iter = $set->iterator;
while ( my $dt = $iter->next )
{
print $dt->ymd;
};
</c>
produced an infinite loop with the error message "iterator can't find a previous value". I intended to add later
<c>
my $set2 = $set->grep(
sub {
return ( $_->hour > 7 or $_->hour < 23);
}
);
my $iter = $set2->iterator;
while ( my $dt = $iter->next )
{
print $dt->ymd;
};
</c>
<br>
Where is my mistake?<br>
Many thanks again - also for answering my previous question!<br>VE
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