Calendar::Slots - Manage time slots


version 0.15


        use Calendar::Slots;
        my $cal = new Calendar::Slots;
        $cal->slot( date=>'2009-10-11', start=>'10:30', end=>'11:30', name=>'busy' ); 
        my $slot = $cal->find( date=>'2009-10-11', time=>'11:00' );
        print $slot->name;    # 'busy'


This is a simple module to manage a calendar of very generic time slots. Time slots are anything with a start and end time on a given date or weekday. Time slots cannot overlap. If a new time slot overlaps another pre-existing time slot, the calendar will acommodate the slot automatically.

It handles two types of slots: fixed dates, or recurring on weekdays. When looking for an event, it will search from most specific (date) to more generic (recurring). That is, if a slot exist for both a date and a weekday, it returns the date slot only.

The calendar is able to compact itself and generate rows that can be easily stored in a file or database.


Some of it current limitations:

  • No overlapping of time slots.

  • If a time-slot spans over midnight, two slots will be created, one for the selected date until midnight, and another for the next day from midnight until end-time.

  • It does not handle timezones.

  • It does not know of daylight-savings or any other DateTime features.


slot ( name=>Str, { date=>'YYYY-MM-DD' | weekday=>1..7 | start_date/end_date }, start=>'HH:MM', end=>'HH:MM' )

Add a time slot to the calendar.

If the new time slot overlaps an existing slot with the same name, the slots are merged and become a single slot.

If the new time slot overlaps an existing slot with a different name, it overwrites the previous slot, splitting it if necessary.

        my $cal = Calendar::Slots->new;
        # reserve that monday slot

        $cal->slot( date=>'2009-11-30', start=>'10:30', end=>'11:00', name=>'doctor appointment' ); 

        # create a time slot for a given date

        $cal->slot( date=>'2009-01-01', start=>'10:30', end=>'24:00' ); 

        # create a recurring time slot over 3 calendar days

        $cal->slot( start_date=>'2009-01-01', end_date=>'2009-02-01', start=>'10:30', end=>'24:00' ); 

find ( { date=>'YYYY-MM-DD' | weekday=>1..7 }, time=>'HH:MM' )

Returns a Calendar::Slots::Slot object for a given .

        $cal->find( weekday=>1, time=>'11:30' );   # find what's on Monday at 11:30


Shortcut method to find a slot and return a name.


Returns a ARRAY of all slot objects in the calendar.

materialize ( start_date, end_date )

Returns an instance of Calendar::Slots with date slots converted into weekdays for a given date range.

    my $new_cal = $cal->materialize( 2012_10_22, 2012_10_28 );

week_of ( date )

Returns a materialized instance of Calendar::Slots with actual dates merged for the week that comprises the passed date.

    my $week = $cal->week_of( 2012_10_22 );
    $week->find( weekday=>2, time=>10_30 );  # ...


Returns an ARRAY of all slot objects in the calendar.


Returns a console string as a table for the calendar.

Requires that Data::Format::Pretty::Console be installed.

    print $cal->as_table;




There are many improvements planned for this module, as this is just an ALPHA release that allows me to get somethings done at $work...

  • Other types of recurrence: first Monday, last Friday of September...

  • Merge several calendars into one.

  • Create subclasses of Calendar::Slots::Slot for each slot type.

  • Better input formatting based on DateTime objects and the such.


Rodrigo de Oliveira


This library is free software. You can redistribute it and/or modify it under the same terms as Perl itself.

1 POD Error

The following errors were encountered while parsing the POD:

Around line 413:

You forgot a '=back' before '=head1'