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A question to iterator in Datetime::Event::Recurrence

by vagabonding electron (Hermit)
on Apr 11, 2012 at 09:31 UTC ( #964486=perlquestion: print w/ replies, xml ) Need Help??
vagabonding electron has asked for the wisdom of the Perl Monks concerning the following question:

Dear Monks,
I try to iterate over the generated set of datetimes in the following way:
#!/usr/bin/perl use strict; use warnings; use DateTime; use DateTime::Event::Recurrence; use DateTime::Format::Strptime; 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); my $day_set = DateTime::Event::Recurrence->hourly(); my $it = $day_set->iterator ( start => $start->truncate(to=>"hour"), before => $end->truncate(to=>"hour"), ); while ( my $dt = $it->next() ) { print $dt->datetime(), "\n"; }
This works.
What I need however is to generate only the hours between 07:00:00 and 22:00 :00.
I tried
my $day_set = DateTime::Event::Recurrence->hourly( hours => [7, 22], );
but this brings an error message "invalid argument 'hours' " - apparently one can use only the next low time step since it works with minutes=>[10, 30] for example.
I have not much experience with Datetime modules yet.
Please give me a hint.
Thanks in advance.
VE

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Re: A question to iterator in Datetime::Event::Recurrence
by Anonymous Monk on Apr 11, 2012 at 09:56 UTC

    Please give me a hint.

    Ditch DateTime::Event::Recurrence :) or explain your requirements better, my impression, you want some math

    print " ###### \n"; while( $start < $end ){ print "$start\n"; $start->add( hours => 1 ); }
      Thank you very much!

      Ditch DateTime::Event::Recurrence :)

      Now after I have tried so much to familiarize to it? :-)

      The task is to calculate the bed occupancies in a unit to every certain hour. The start and the end points are known, the iterator generates the hours and then I use $hash{$dt->datetime()}{$id}[0] = 1 for each hour (to sum it later).
      The print was used just to debug.
      The way around could be to use
      while ( my $dt = $it->next() ) { print $dt->datetime(), "\n" if ($dt->hour > 6 and $dt->hour < 23); }
      but since I am learning I would like to use the mainstream and not the way around.
      Thanks again!
      VE
Re: A question to iterator in Datetime::Event::Recurrence
by fglock (Vicar) on Apr 11, 2012 at 12:07 UTC

    The parameters specify the occurrences "inside" the base unit:

    my $day_set = DateTime::Event::Recurrence->daily( hours => [ 7 .. 22 ] );

    This may be a bit unexpected, I agree it should be better documented.

      Now tested it.
      The code
      #!/usr/bin/perl use strict; use warnings; use DateTime; use DateTime::Event::Recurrence; use DateTime::Format::Strptime; 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); my $day_set = DateTime::Event::Recurrence->daily( hours => [7, 22], ); my $it = $day_set->iterator ( start => $start->truncate(to=>"hour"), before => $end->truncate(to=>"hour"), ); while ( my $dt = $it->next() ) { print $dt->datetime(), "\n"; }
      prints:
      2012-01-01T07:00:00 2012-01-01T22:00:00 2012-01-02T07:00:00 2012-01-02T22:00:00

      The desired output should be:
      2012-01-01T08:00:00 2012-01-01T09:00:00 2012-01-01T10:00:00 2012-01-01T11:00:00 2012-01-01T12:00:00 2012-01-01T13:00:00 2012-01-01T14:00:00 2012-01-01T15:00:00 2012-01-01T16:00:00 2012-01-01T17:00:00 2012-01-01T18:00:00 2012-01-01T19:00:00 2012-01-01T20:00:00 2012-01-01T21:00:00 2012-01-01T22:00:00 2012-01-02T08:00:00 2012-01-02T09:00:00 2012-01-02T10:00:00 2012-01-02T11:00:00 2012-01-02T12:00:00 2012-01-02T13:00:00 2012-01-02T14:00:00 2012-01-02T15:00:00 2012-01-02T16:00:00 2012-01-02T17:00:00 2012-01-02T18:00:00 2012-01-02T19:00:00 2012-01-02T20:00:00 2012-01-02T21:00:00 2012-01-02T22:00:00
      which is produced by your code from Re^5: A question to iterator in Datetime::Event::Recurrence but not the above code.
      ... This assumed that I understood everything correctly :-)
      Greetings, VE

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