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.\" ========================================================================
.\"
.IX Title "DateTime::Event::ICal 3pm"
.TH DateTime::Event::ICal 3pm "2015-10-01" "perl v5.20.2" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
DateTime::Event::ICal \- Perl DateTime extension for computing rfc2445 recurrences.
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 2
\& use DateTime;
\& use DateTime::Event::ICal;
\&
\& my $dt = DateTime\->new( year   => 2000,
\&                         month  => 6,
\&                         day    => 20,
\&                       );
\&
\& my $set = DateTime::Event::ICal\->recur( 
\&      dtstart => $dt,
\&      freq =>    \*(Aqdaily\*(Aq,
\&      bymonth => [ 10, 12 ],
\&      byhour =>  [ 10 ]
\& );
\&
\& my $dt_next = $set\->next( $dt );
\&
\& my $dt_previous = $set\->previous( $dt );
\&
\& my $bool = $set\->contains( $dt );
\&
\& my @days = $set\->as_list( start => $dt1, end => $dt2 );
\&
\& my $iter = $set\->iterator;
\&
\& while ( my $dt = $iter\->next ) {
\&     print \*(Aq \*(Aq, $dt\->datetime;
\& }
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This module provides convenience methods that let you easily create
\&\f(CW\*(C`DateTime::Set\*(C'\fR objects for rfc2445 style recurrences.
.SH "USAGE"
.IX Header "USAGE"
.IP "recur" 4
.IX Item "recur"
This method returns a DateTime::Set object representing the
given recurrence.
.Sp
.Vb 1
\&  my $set = DateTime::Event::ICal\->recur( %args );
.Ve
.Sp
This method takes parameters which correspond to the rule parts
specified in section 4.3.10 of \s-1RFC 2445. \s0 Rather than rewrite that \s-1RFC\s0
here, you are encouraged to read that first if you want to understand
what all these parameters represent.
.RS 4
.IP "\(bu" 4
dtstart
.Sp
A DateTime object, which is the start date.
.Sp
This datetime is not included in the recurrence, unless it satisfies
the recurrence's rules.
.Sp
A set can thus be used for creating exclusion rules (rfc2445
\&\f(CW\*(C`exrule\*(C'\fR), which don't include \f(CW\*(C`dtstart\*(C'\fR.
.IP "\(bu" 4
until
.Sp
A DateTime object which specifies the recurrence's end date.  Can also
be specified as \*(L"dtend\*(R".
.IP "\(bu" 4
count
.Sp
A positive number which indicate the total number of recurrences.
Giving both a \*(L"count\*(R" and an \*(L"until\*(R" parameter is pointless, though it
is currently allowed.
.IP "\(bu" 4
freq
.Sp
One of:
.Sp
.Vb 2
\&   "yearly", "monthly", "weekly", "daily",
\&   "hourly", "minutely", "secondly"
.Ve
.Sp
See the \f(CW\*(C`DateTime::Event::Recurrence\*(C'\fR documentation for more details
on what these mean.
.IP "\(bu" 4
interval
.Sp
The interval between recurrences.  This is a multiplier for the value
specified by \*(L"freq\*(R".  It defaults to 1.
.Sp
So if you specify a \*(L"freq\*(R" of \*(L"yearly\*(R" and an \*(L"interval\*(R" of 3, that
means a recurrence that occurs every three years.
.IP "\(bu" 4
wkst
.Sp
Week start day.  This can be one of: \*(L"mo\*(R", \*(L"tu\*(R", \*(L"we\*(R", \*(L"th\*(R", \*(L"fr\*(R",
\&\*(L"sa\*(R", \*(L"su\*(R".  The default is Monday (\*(L"mo\*(R").
.Sp
\&\fBNote: this parameter is not yet implemented\fR
.IP "\(bu" 4
bysecond => [ list ], byminute => [ list ], byhour => [ list ]
.Sp
This should be one or more positive or numbers, specified as a scalar
or array reference.  Each number represents a second/minute/hour.
.Sp
See \s-1RFC 2445,\s0 section 4.3.10 for more details.
.IP "\(bu" 4
byday => [ list ]
.Sp
This should be a scalar or array reference containing days of the
week, specified as \*(L"mo\*(R", \*(L"tu\*(R", \*(L"we\*(R", \*(L"th\*(R", \*(L"fr\*(R", \*(L"sa\*(R", \*(L"su\*(R"
.Sp
The day of week may have a prefix:
.Sp
.Vb 2
\& "1tu",  # the first tuesday of month or year
\& "\-2we"  # the second to last wednesday of month or year
.Ve
.Sp
See \s-1RFC 2445,\s0 section 4.3.10 for more details.
.IP "\(bu" 4
bymonthday => [ list ], byyearday => [ list ]
.Sp
A scalar or array reference containing positive or negative numbers,
but not zero.  For \*(L"bymonthday\*(R", the allowed ranges are \-31 to \-1.
For \*(L"byyearday\*(R", the allowed ranges are \-366 to \-1, and 1 to 366.
.Sp
Day \-1 is last day of month or year.
.Sp
See \s-1RFC 2445,\s0 section 4.3.10 for more details.
.IP "\(bu" 4
byweekno => [ list ]
.Sp
A scalar or array reference containing positive or negative numbers,
but not zero.  The allowed ranges are \-53 to \-1, and 1 to 53.
.Sp
The first week of year is week 1.
.Sp
The default week start day is Monday.
.Sp
Week \-1 is the last week of year.
.Sp
See \s-1RFC 2445,\s0 section 4.3.10 for more details.
.IP "\(bu" 4
bymonth => [ list ]
.Sp
A scalar or array reference containing positive or negative numbers,
from \-12 to \-1 and 1 to 12.
.Sp
Month \-1 is December.
.Sp
See \s-1RFC 2445,\s0 section 4.3.10 for more details.
.IP "\(bu" 4
bysetpos => [ list ]
.Sp
This can be either a scalar or an array reference of positive and
negative numbers from \-366 to \-1, and 1 to 366.  This parameter is
used in conjunction with one of the other \*(L"by...\*(R" parameters.
.Sp
See \s-1RFC 2445,\s0 section 4.3.10 for more details.
.RE
.RS 4
.RE
.SH "AUTHOR"
.IX Header "AUTHOR"
Flavio Soibelmann Glock
fglock@gmail.com
.SH "CREDITS"
.IX Header "CREDITS"
The \s-1API\s0 was developed with help from the people
in the datetime@perl.org list.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright (c) 2003 Flavio Soibelmann Glock.  
All rights reserved.  This program
is free software; you can redistribute it and/or modify it under the
same terms as Perl itself.
.PP
The full text of the license can be found in the \s-1LICENSE\s0 file included
with this module.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
datetime@perl.org mailing list
.PP
DateTime Web page <http://datetime.perl.org/>
.PP
The DateTime module.
.PP
DateTime::Event::Recurrence \- simple rule-based recurrences.
.PP
DateTime::Format::ICal \- can parse rfc2445 recurrences.
.PP
DateTime::Set \- recurrences defined by callback subroutines.
.PP
DateTime::Event::Cron \- recurrences defined by \*(L"cron\*(R" rules.
.PP
DateTime::SpanSet
.PP
\&\s-1RFC2445\s0 <http://www.ietf.org/rfc/rfc2445.txt> \-
Internet Calendaring and Scheduling Core Object Specification.