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.\" ========================================================================
.\"
.IX Title "DateTime::Span 3pm"
.TH DateTime::Span 3pm "2021-01-01" "perl v5.32.0" "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::Span \- Datetime spans
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 2
\&    use DateTime;
\&    use DateTime::Span;
\&
\&    $date1 = DateTime\->new( year => 2002, month => 3, day => 11 );
\&    $date2 = DateTime\->new( year => 2003, month => 4, day => 12 );
\&    $set2 = DateTime::Span\->from_datetimes( start => $date1, end => $date2 );
\&    #  set2 = 2002\-03\-11 until 2003\-04\-12
\&
\&    $set = $set1\->union( $set2 );         # like "OR", "insert", "both"
\&    $set = $set1\->complement( $set2 );    # like "delete", "remove"
\&    $set = $set1\->intersection( $set2 );  # like "AND", "while"
\&    $set = $set1\->complement;             # like "NOT", "negate", "invert"
\&
\&    if ( $set1\->intersects( $set2 ) ) { ...  # like "touches", "interferes"
\&    if ( $set1\->contains( $set2 ) ) { ...    # like "is\-fully\-inside"
\&
\&    # data extraction 
\&    $date = $set1\->start;           # first date of the span
\&    $date = $set1\->end;             # last date of the span
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\f(CW\*(C`DateTime::Span\*(C'\fR is a module for handling datetime spans, otherwise
known as ranges or periods (\*(L"from X to Y, inclusive of all datetimes
in between\*(R").
.PP
This is different from a \f(CW\*(C`DateTime::Set\*(C'\fR, which is made of individual
datetime points as opposed to a range. There is also a module
\&\f(CW\*(C`DateTime::SpanSet\*(C'\fR to handle sets of spans.
.SH "METHODS"
.IX Header "METHODS"
.IP "\(bu" 4
from_datetimes
.Sp
Creates a new span based on a starting and ending datetime.
.Sp
A 'closed' span includes its end-dates:
.Sp
.Vb 1
\&   $span = DateTime::Span\->from_datetimes( start => $dt1, end => $dt2 );
.Ve
.Sp
An 'open' span does not include its end-dates:
.Sp
.Vb 1
\&   $span = DateTime::Span\->from_datetimes( after => $dt1, before => $dt2 );
.Ve
.Sp
A 'semi\-open' span includes one of its end-dates:
.Sp
.Vb 2
\&   $span = DateTime::Span\->from_datetimes( start => $dt1, before => $dt2 );
\&   $span = DateTime::Span\->from_datetimes( after => $dt1, end => $dt2 );
.Ve
.Sp
A span might have just a starting date, or just an ending date.
These spans end, or start, in an imaginary 'forever' date:
.Sp
.Vb 4
\&   $span = DateTime::Span\->from_datetimes( start => $dt1 );
\&   $span = DateTime::Span\->from_datetimes( end => $dt2 );
\&   $span = DateTime::Span\->from_datetimes( after => $dt1 );
\&   $span = DateTime::Span\->from_datetimes( before => $dt2 );
.Ve
.Sp
You cannot give both a \*(L"start\*(R" and \*(L"after\*(R" argument, nor can you give
both an \*(L"end\*(R" and \*(L"before\*(R" argument.  Either of these conditions will
cause the \f(CW\*(C`from_datetimes()\*(C'\fR method to die.
.Sp
To summarize, a datetime passed as either \*(L"start\*(R" or \*(L"end\*(R" is included
in the span.  A datetime passed as either \*(L"after\*(R" or \*(L"before\*(R" is
excluded from the span.
.IP "\(bu" 4
from_datetime_and_duration
.Sp
Creates a new span.
.Sp
.Vb 4
\&   $span = DateTime::Span\->from_datetime_and_duration( 
\&       start => $dt1, duration => $dt_dur1 );
\&   $span = DateTime::Span\->from_datetime_and_duration( 
\&       after => $dt1, hours => 12 );
.Ve
.Sp
The new \*(L"end of the set\*(R" is \fIopen\fR by default.
.IP "\(bu" 4
clone
.Sp
This object method returns a replica of the given object.
.IP "\(bu" 4
set_time_zone( \f(CW$tz\fR )
.Sp
This method accepts either a time zone object or a string that can be
passed as the \*(L"name\*(R" parameter to \f(CW\*(C`DateTime::TimeZone\->new()\*(C'\fR.
If the new time zone's offset is different from the old time zone,
then the \fIlocal\fR time is adjusted accordingly.
.Sp
If the old time zone was a floating time zone, then no adjustments to
the local time are made, except to account for leap seconds.  If the
new time zone is floating, then the \fI\s-1UTC\s0\fR time is adjusted in order
to leave the local time untouched.
.IP "\(bu" 4
duration
.Sp
The total size of the set, as a \f(CW\*(C`DateTime::Duration\*(C'\fR object, or as a
scalar containing infinity.
.Sp
Also available as \f(CW\*(C`size()\*(C'\fR.
.IP "\(bu" 4
start, min
.IP "\(bu" 4
end, max
.Sp
First or last dates in the span.
.Sp
It is possible that the return value from these methods may be a
\&\f(CW\*(C`DateTime::Infinite::Future\*(C'\fR or a \f(CW\*(C`DateTime::Infinite::Past\*(C'\fRxs object.
.Sp
If the set ends \f(CW\*(C`before\*(C'\fR a date \f(CW$dt\fR, it returns \f(CW$dt\fR. Note that
in this case \f(CW$dt\fR is not a set element \- but it is a set boundary.
.Sp
These methods return just a \fIcopy\fR of the actual boundary value.
If you modify the result, the set will not be modified.
.IP "\(bu" 4
start_is_closed
.IP "\(bu" 4
end_is_closed
.Sp
Returns true if the first or last dates belong to the span ( start <= x <= end ).
.IP "\(bu" 4
start_is_open
.IP "\(bu" 4
end_is_open
.Sp
Returns true if the first or last dates are excluded from the span ( start < x < end ).
.IP "\(bu" 4
union
.IP "\(bu" 4
intersection
.IP "\(bu" 4
complement
.Sp
Set operations may be performed not only with \f(CW\*(C`DateTime::Span\*(C'\fR
objects, but also with \f(CW\*(C`DateTime::Set\*(C'\fR and \f(CW\*(C`DateTime::SpanSet\*(C'\fR
objects.  These set operations always return a \f(CW\*(C`DateTime::SpanSet\*(C'\fR
object.
.Sp
.Vb 4
\&    $set = $span\->union( $set2 );         # like "OR", "insert", "both"
\&    $set = $span\->complement( $set2 );    # like "delete", "remove"
\&    $set = $span\->intersection( $set2 );  # like "AND", "while"
\&    $set = $span\->complement;             # like "NOT", "negate", "invert"
.Ve
.IP "\(bu" 4
intersects
.IP "\(bu" 4
contains
.Sp
These set functions return a boolean value.
.Sp
.Vb 2
\&    if ( $span\->intersects( $set2 ) ) { ...  # like "touches", "interferes"
\&    if ( $span\->contains( $dt ) ) { ...    # like "is\-fully\-inside"
.Ve
.Sp
These methods can accept a \f(CW\*(C`DateTime\*(C'\fR, \f(CW\*(C`DateTime::Set\*(C'\fR,
\&\f(CW\*(C`DateTime::Span\*(C'\fR, or \f(CW\*(C`DateTime::SpanSet\*(C'\fR object as an argument.
.SH "SUPPORT"
.IX Header "SUPPORT"
Support is offered through the \f(CW\*(C`datetime@perl.org\*(C'\fR mailing list.
.PP
Please report bugs using rt.cpan.org
.SH "AUTHOR"
.IX Header "AUTHOR"
Flavio Soibelmann Glock <fglock@gmail.com>
.PP
The \s-1API\s0 was developed together with Dave Rolsky and the DateTime Community.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright (c) 2003\-2006 Flavio Soibelmann Glock. All rights reserved.
This program is free software; you can distribute 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"
Set::Infinite
.PP
For details on the Perl DateTime Suite project please see
<http://datetime.perl.org>.