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.\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index
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.\" ========================================================================
.\"
.IX Title "DateTime::Format::ISO8601 3pm"
.TH DateTime::Format::ISO8601 3pm "2022-12-06" "perl v5.36.0" "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::Format::ISO8601 \- Parses ISO8601 formats
.SH "VERSION"
.IX Header "VERSION"
version 0.16
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&    use DateTime::Format::ISO8601;
\&
\&    my $datetime_str = \*(Aq2020\-07\-25T11:32:31\*(Aq;
\&    my $dt = DateTime::Format::ISO8601\->parse_datetime($datetime_str);
\&    say $dt;
\&
\&    # This format is ambiguous and could be either a date or time, so use the
\&    # parse_time method.
\&    my $time_str = \*(Aq113231\*(Aq;
\&    $dt = DateTime::Format::ISO8601\->parse_time($time_str);
\&    say $dt;
\&
\&    # or
\&
\&    my $iso8601 = DateTime::Format::ISO8601\->new;
\&    $dt = $iso8601\->parse_datetime($datetime_str);
\&    say $dt;
\&
\&    $dt = $iso8601\->parse_time($time_str);
\&    say $dt;
\&
\&    say DateTime::Format::ISO8601\->format_datetime($dt);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Parses almost all \s-1ISO8601\s0 date and time formats. \s-1ISO8601\s0 time-intervals will be
supported in a later release.
.SH "METHODS"
.IX Header "METHODS"
This class provides the following methods:
.SS "Constructors"
.IX Subsection "Constructors"
\fIDateTime::Format::ISO8601\->new( ... )\fR
.IX Subsection "DateTime::Format::ISO8601->new( ... )"
.PP
Accepts an optional hash.
.PP
.Vb 5
\&    my $iso8601 = DateTime::Format::ISO8601\->new(
\&        base_datetime => $dt,
\&        cut_off_year  => 42,
\&        legacy_year   => 1,
\&    );
.Ve
.IP "\(bu" 4
base_datetime
.Sp
A \f(CW\*(C`DateTime\*(C'\fR object that will be used to fill in missing information from
incomplete date/time formats.
.Sp
This key is optional.
.IP "\(bu" 4
cut_off_year
.Sp
A integer representing the cut-off point between interpreting 2\-digits years as
19xx or 20xx.
.Sp
.Vb 2
\&    2\-digit years <  cut_off_year will be interpreted as 20xx
\&    2\-digit years >= cut_off_year will be untreated as 19xx
.Ve
.Sp
This key defaults to the value of \f(CW\*(C`DefaultCutOffYear\*(C'\fR.
.IP "\(bu" 4
legacy_year
.Sp
A boolean value controlling if a 2\-digit year is interpreted as being in the
current century (unless a \f(CW\*(C`base_datetime\*(C'\fR is set) or if \f(CW\*(C`cut_off_year\*(C'\fR should
be used to place the year in either 20xx or 19xx.
.Sp
If this is true, then the \f(CW\*(C`cut_off_year\*(C'\fR is used. If this is false, then the
year is always interpreted as being in the current century.
.Sp
This key defaults to the value of \f(CW\*(C`DefaultLegacyYear\*(C'\fR.
.PP
\fI\f(CI$iso8601\fI\->clone\fR
.IX Subsection "$iso8601->clone"
.PP
Returns a replica of the given object.
.SS "Object Methods"
.IX Subsection "Object Methods"
\fI\f(CI$iso8601\fI\->base_datetime\fR
.IX Subsection "$iso8601->base_datetime"
.PP
Returns a \f(CW\*(C`DateTime\*(C'\fR object if a \f(CW\*(C`base_datetime\*(C'\fR has been set.
.PP
\fI\f(CI$iso8601\fI\->set_base_datetime( object => \f(CI$object\fI )\fR
.IX Subsection "$iso8601->set_base_datetime( object => $object )"
.PP
Accepts a \f(CW\*(C`DateTime\*(C'\fR object that will be used to fill in missing information
from incomplete date/time formats.
.PP
\fI\f(CI$iso8601\fI\->cut_off_year\fR
.IX Subsection "$iso8601->cut_off_year"
.PP
Returns a integer representing the cut-off point between interpreting 2\-digits
years as 19xx or 20xx.
.PP
\fI\f(CI$iso8601\fI\->set_cut_off_year($int)\fR
.IX Subsection "$iso8601->set_cut_off_year($int)"
.PP
Accepts a integer representing the cut-off point between interpreting 2\-digits
years as 19xx or 20xx.
.PP
.Vb 2
\&    2\-digit years <  legacy_year will be interpreted as 20xx
\&    2\-digit years >= legacy_year will be interpreted as 19xx
.Ve
.PP
\fI\f(CI$iso8601\fI\->legacy_year\fR
.IX Subsection "$iso8601->legacy_year"
.PP
Returns a boolean value indicating the 2\-digit year handling behavior.
.PP
\fI\f(CI$iso8601\fI\->set_legacy_year($bool)\fR
.IX Subsection "$iso8601->set_legacy_year($bool)"
.PP
Accepts a boolean value controlling if a 2\-digit year is interpreted as being
in the current century (unless a \f(CW\*(C`base_datetime\*(C'\fR is set) or if \f(CW\*(C`cut_off_year\*(C'\fR
should be used to place the year in either 20xx or 19xx.
.SS "Class Methods"
.IX Subsection "Class Methods"
\fIDateTime::Format::ISO8601\->DefaultCutOffYear($int)\fR
.IX Subsection "DateTime::Format::ISO8601->DefaultCutOffYear($int)"
.PP
Accepts a integer representing the cut-off point for 2\-digit years when calling
\&\f(CW\*(C`parse_*\*(C'\fR as class methods and the default value for \f(CW\*(C`cut_off_year\*(C'\fR when
creating objects. If called with no parameters this method will return the
default value for \f(CW\*(C`cut_off_year\*(C'\fR.
.PP
\fIDateTime::Format::ISO8601\->DefaultLegacyYear($bool)\fR
.IX Subsection "DateTime::Format::ISO8601->DefaultLegacyYear($bool)"
.PP
Accepts a boolean value controlling the legacy year behavior when calling
\&\f(CW\*(C`parse_*\*(C'\fR as class methods and the default value for \f(CW\*(C`legacy_year\*(C'\fR when
creating objects. If called with no parameters this method will return the
default value for \f(CW\*(C`legacy_year\*(C'\fR.
.SS "Parser(s)"
.IX Subsection "Parser(s)"
These methods may be called as either class or object methods.
.PP
\fIparse_datetime\fR
.IX Subsection "parse_datetime"
.PP
\fIparse_time\fR
.IX Subsection "parse_time"
.PP
Please see the \*(L"\s-1FORMATS\*(R"\s0 section.
.SS "Formatter"
.IX Subsection "Formatter"
This may be called as either class or object method.
.PP
\fIformat_datetime($dt)\fR
.IX Subsection "format_datetime($dt)"
.PP
Formats the datetime in an ISO8601\-compatible format. This differs from
\&\*(L"iso8601\*(R" in DateTime by including nanoseconds/milliseconds and the correct
timezone offset.
.SH "FORMATS"
.IX Header "FORMATS"
There are 6 strings that can match against date only or time only formats. The
\&\f(CW\*(C`parse_datetime\*(C'\fR method will attempt to match these ambiguous strings against
date only formats. If you want to match against the time only formats use the
\&\f(CW\*(C`parse_time\*(C'\fR method.
.SS "Conventions"
.IX Subsection "Conventions"
.IP "\(bu" 4
Expanded \s-1ISO8601\s0
.Sp
These formats are supported with exactly 6 digits for the year. Support for a
variable number of digits will be in a later release.
.IP "\(bu" 4
Precision
.Sp
If a format doesn't include a year all larger time unit up to and including the
year are filled in using the current date/time or [if set] the \f(CW\*(C`base_datetime\*(C'\fR
object.
.IP "\(bu" 4
Fractional time
.Sp
There is no limit on the expressed precision.
.SS "Supported via parse_datetime"
.IX Subsection "Supported via parse_datetime"
The supported formats are listed by the section of \s-1ISO 8601:2000\s0(E) in which
they appear.
.PP
\fI5.2 Dates\fR
.IX Subsection "5.2 Dates"
.IP "\(bu" 4
5.2.1.1
.RS 4
.IP "\s-1YYYYMMDD\s0" 8
.IX Item "YYYYMMDD"
.PD 0
.IP "YYYY-MM-DD" 8
.IX Item "YYYY-MM-DD"
.RE
.RS 4
.RE
.IP "\(bu" 4
.PD
5.2.1.2
.RS 4
.IP "YYYY-MM" 8
.IX Item "YYYY-MM"
.PD 0
.IP "\s-1YYYY\s0" 8
.IX Item "YYYY"
.IP "\s-1YY\s0" 8
.IX Item "YY"
.RE
.RS 4
.RE
.IP "\(bu" 4
.PD
5.2.1.3
.RS 4
.IP "\s-1YYMMDD\s0" 8
.IX Item "YYMMDD"
.PD 0
.IP "YY-MM-DD" 8
.IX Item "YY-MM-DD"
.IP "\-YYMM" 8
.IX Item "-YYMM"
.IP "\-YY\-MM" 8
.IX Item "-YY-MM"
.IP "\-YY" 8
.IX Item "-YY"
.IP "\-\-MMDD" 8
.IX Item "--MMDD"
.IP "\-\-MM\-DD" 8
.IX Item "--MM-DD"
.IP "\-\-MM" 8
.IX Item "--MM"
.IP "\-\-\-DD" 8
.IX Item "---DD"
.RE
.RS 4
.RE
.IP "\(bu" 4
.PD
5.2.1.4
.RS 4
.IP "+[\s-1YY\s0]YYYYMMDD" 8
.IX Item "+[YY]YYYYMMDD"
.PD 0
.IP "+[\s-1YY\s0]YYYY\-MM\-DD" 8
.IX Item "+[YY]YYYY-MM-DD"
.IP "+[\s-1YY\s0]YYYY\-MM" 8
.IX Item "+[YY]YYYY-MM"
.IP "+[\s-1YY\s0]YYYY" 8
.IX Item "+[YY]YYYY"
.IP "+[\s-1YY\s0]YY" 8
.IX Item "+[YY]YY"
.RE
.RS 4
.RE
.IP "\(bu" 4
.PD
5.2.2.1
.RS 4
.IP "\s-1YYYYDDD\s0" 8
.IX Item "YYYYDDD"
.PD 0
.IP "YYYY-DDD" 8
.IX Item "YYYY-DDD"
.RE
.RS 4
.RE
.IP "\(bu" 4
.PD
5.2.2.2
.RS 4
.IP "\s-1YYDDD\s0" 8
.IX Item "YYDDD"
.PD 0
.IP "YY-DDD" 8
.IX Item "YY-DDD"
.IP "\-DDD" 8
.IX Item "-DDD"
.RE
.RS 4
.RE
.IP "\(bu" 4
.PD
5.2.2.3
.RS 4
.IP "+[\s-1YY\s0]YYYYDDD" 8
.IX Item "+[YY]YYYYDDD"
.PD 0
.IP "+[\s-1YY\s0]YYYY\-DDD" 8
.IX Item "+[YY]YYYY-DDD"
.RE
.RS 4
.RE
.IP "\(bu" 4
.PD
5.2.3.1
.RS 4
.IP "YYYYWwwD" 8
.IX Item "YYYYWwwD"
.PD 0
.IP "YYYY-Www-D" 8
.IX Item "YYYY-Www-D"
.RE
.RS 4
.RE
.IP "\(bu" 4
.PD
5.2.3.2
.RS 4
.IP "YYYYWww" 8
.IX Item "YYYYWww"
.PD 0
.IP "YYYY-Www" 8
.IX Item "YYYY-Www"
.IP "YYWwwD" 8
.IX Item "YYWwwD"
.IP "YY-Www-D" 8
.IX Item "YY-Www-D"
.IP "YYWww" 8
.IX Item "YYWww"
.IP "YY-Www" 8
.IX Item "YY-Www"
.IP "\-YWwwD" 8
.IX Item "-YWwwD"
.IP "\-Y\-Www\-D" 8
.IX Item "-Y-Www-D"
.IP "\-YWww" 8
.IX Item "-YWww"
.IP "\-Y\-Www" 8
.IX Item "-Y-Www"
.IP "\-WwwD" 8
.IX Item "-WwwD"
.IP "\-Www\-D" 8
.IX Item "-Www-D"
.IP "\-Www" 8
.IX Item "-Www"
.IP "\-W\-D" 8
.IX Item "-W-D"
.RE
.RS 4
.RE
.IP "\(bu" 4
.PD
5.2.3.4
.RS 4
.IP "+[\s-1YY\s0]YYYYWwwD" 8
.IX Item "+[YY]YYYYWwwD"
.PD 0
.IP "+[\s-1YY\s0]YYYY\-Www\-D" 8
.IX Item "+[YY]YYYY-Www-D"
.IP "+[\s-1YY\s0]YYYYWww" 8
.IX Item "+[YY]YYYYWww"
.IP "+[\s-1YY\s0]YYYY\-Www" 8
.IX Item "+[YY]YYYY-Www"
.RE
.RS 4
.RE
.PD
.PP
\fI5.3 Time of Day\fR
.IX Subsection "5.3 Time of Day"
.IP "\(bu" 4
5.3.1.1 \- 5.3.1.3
.Sp
Values can optionally be prefixed with 'T'.
.IP "\(bu" 4
5.3.1.1
.RS 4
.IP "hh:mm:ss" 8
.IX Item "hh:mm:ss"
.RE
.RS 4
.RE
.PD 0
.IP "\(bu" 4
.PD
5.3.1.2
.RS 4
.IP "hh:mm" 8
.IX Item "hh:mm"
.RE
.RS 4
.RE
.PD 0
.IP "\(bu" 4
.PD
5.3.1.3 \- 5.3.1.4
.Sp
fractional (decimal) separator maybe either ',' or '.'
.IP "\(bu" 4
5.3.1.3
.RS 4
.IP "hhmmss,ss" 8
.IX Item "hhmmss,ss"
.PD 0
.IP "hh:mm:ss,ss" 8
.IX Item "hh:mm:ss,ss"
.IP "hhmm,mm" 8
.IX Item "hhmm,mm"
.IP "hh:mm,mm" 8
.IX Item "hh:mm,mm"
.IP "hh,hh" 8
.IX Item "hh,hh"
.RE
.RS 4
.RE
.IP "\(bu" 4
.PD
5.3.1.4
.RS 4
.IP "\-mm:ss" 8
.IX Item "-mm:ss"
.PD 0
.IP "\-mmss,s" 8
.IX Item "-mmss,s"
.IP "\-mm:ss,s" 8
.IX Item "-mm:ss,s"
.IP "\-mm,m" 8
.IX Item "-mm,m"
.IP "\-\-ss,s" 8
.IX Item "--ss,s"
.RE
.RS 4
.RE
.IP "\(bu" 4
.PD
5.3.3 \- 5.3.4.2
.Sp
Values can optionally be prefixed with 'T'.
.IP "\(bu" 4
5.3.3
.RS 4
.IP "hhmmssZ" 8
.IX Item "hhmmssZ"
.PD 0
.IP "hh:mm:ssZ" 8
.IX Item "hh:mm:ssZ"
.IP "hhmmZ" 8
.IX Item "hhmmZ"
.IP "hh:mmZ" 8
.IX Item "hh:mmZ"
.IP "hhZ" 8
.IX Item "hhZ"
.IP "hhmmss.ssZ" 8
.IX Item "hhmmss.ssZ"
.IP "hh:mm:ss.ssZ" 8
.IX Item "hh:mm:ss.ssZ"
.RE
.RS 4
.RE
.IP "\(bu" 4
.PD
5.3.4.2
.RS 4
.IP "hhmmss[+\-]hhmm" 8
.IX Item "hhmmss[+-]hhmm"
.PD 0
.IP "hh:mm:ss[+\-]hh:mm" 8
.IX Item "hh:mm:ss[+-]hh:mm"
.IP "hhmmss[+\-]hh" 8
.IX Item "hhmmss[+-]hh"
.IP "hh:mm:ss[+\-]hh" 8
.IX Item "hh:mm:ss[+-]hh"
.IP "hhmmss.ss[+\-]hhmm" 8
.IX Item "hhmmss.ss[+-]hhmm"
.IP "hh:mm:ss.ss[+\-]hh:mm" 8
.IX Item "hh:mm:ss.ss[+-]hh:mm"
.RE
.RS 4
.RE
.PD
.PP
\fI5.4 Combinations of date and time of day\fR
.IX Subsection "5.4 Combinations of date and time of day"
.IP "\(bu" 4
5.4.1
.RS 4
.IP "YYYYMMDDThhmmss" 8
.IX Item "YYYYMMDDThhmmss"
.PD 0
.IP "YYYY\-MM\-DDThh:mm:ss" 8
.IX Item "YYYY-MM-DDThh:mm:ss"
.IP "YYYYMMDDThhmmssZ" 8
.IX Item "YYYYMMDDThhmmssZ"
.IP "YYYY\-MM\-DDThh:mm:ssZ" 8
.IX Item "YYYY-MM-DDThh:mm:ssZ"
.IP "YYYYMMDDThhmmss[+\-]hhmm" 8
.IX Item "YYYYMMDDThhmmss[+-]hhmm"
.IP "YYYY\-MM\-DDThh:mm:ss[+\-]hh:mm" 8
.IX Item "YYYY-MM-DDThh:mm:ss[+-]hh:mm"
.IP "YYYYMMDDThhmmss[+\-]hh" 8
.IX Item "YYYYMMDDThhmmss[+-]hh"
.IP "YYYY\-MM\-DDThh:mm:ss[+\-]hh" 8
.IX Item "YYYY-MM-DDThh:mm:ss[+-]hh"
.RE
.RS 4
.RE
.IP "\(bu" 4
.PD
5.4.2
.RS 4
.IP "YYYYMMDDThhmmss.ss" 8
.IX Item "YYYYMMDDThhmmss.ss"
.PD 0
.IP "YYYY\-MM\-DDThh:mm:ss.ss" 8
.IX Item "YYYY-MM-DDThh:mm:ss.ss"
.IP "YYYYMMDDThhmmss.ss[+\-]hh" 8
.IX Item "YYYYMMDDThhmmss.ss[+-]hh"
.IP "YYYY\-MM\-DDThh:mm:ss.ss[+\-]hh" 8
.IX Item "YYYY-MM-DDThh:mm:ss.ss[+-]hh"
.IP "YYYYMMDDThhmmss.ss[+\-]hhmm" 8
.IX Item "YYYYMMDDThhmmss.ss[+-]hhmm"
.IP "YYYY\-MM\-DDThh:mm:ss.ss[+\-]hh:mm" 8
.IX Item "YYYY-MM-DDThh:mm:ss.ss[+-]hh:mm"
.RE
.RS 4
.RE
.IP "\(bu" 4
.PD
5.4.3
.Sp
Support for this section is not complete.
.RS 4
.IP "YYYYMMDDThhmm" 8
.IX Item "YYYYMMDDThhmm"
.PD 0
.IP "YYYY\-MM\-DDThh:mm" 8
.IX Item "YYYY-MM-DDThh:mm"
.IP "YYYYMMDDThhmmZ" 8
.IX Item "YYYYMMDDThhmmZ"
.IP "YYYY\-MM\-DDThh:mmZ" 8
.IX Item "YYYY-MM-DDThh:mmZ"
.IP "YYYYDDDThhmm" 8
.IX Item "YYYYDDDThhmm"
.IP "YYYY\-DDDThh:mm" 8
.IX Item "YYYY-DDDThh:mm"
.IP "YYYYDDDThhmmZ" 8
.IX Item "YYYYDDDThhmmZ"
.IP "YYYY\-DDDThh:mmZ" 8
.IX Item "YYYY-DDDThh:mmZ"
.IP "YYYYWwwDThhmm[+\-]hhmm" 8
.IX Item "YYYYWwwDThhmm[+-]hhmm"
.IP "YYYY\-Www\-DThh:mm[+\-]hh" 8
.IX Item "YYYY-Www-DThh:mm[+-]hh"
.RE
.RS 4
.RE
.PD
.PP
\fI5.5 Time-Intervals\fR
.IX Subsection "5.5 Time-Intervals"
.PP
These are not currently supported
.SS "Supported via parse_time"
.IX Subsection "Supported via parse_time"
\fI5.3.1.1 \- 5.3.1.3\fR
.IX Subsection "5.3.1.1 - 5.3.1.3"
.PP
Values can optionally be prefixed with 'T'.
.IP "\(bu" 4
5.3.1.1
.RS 4
.IP "hhmmss" 8
.IX Item "hhmmss"
.RE
.RS 4
.RE
.PD 0
.IP "\(bu" 4
.PD
5.3.1.2
.RS 4
.IP "hhmm" 8
.IX Item "hhmm"
.PD 0
.IP "hh" 8
.IX Item "hh"
.RE
.RS 4
.RE
.IP "\(bu" 4
.PD
5.3.1.4
.RS 4
.IP "\-mmss" 8
.IX Item "-mmss"
.PD 0
.IP "\-mm" 8
.IX Item "-mm"
.IP "\-\-ss" 8
.IX Item "--ss"
.RE
.RS 4
.RE
.PD
.SH "STANDARDS DOCUMENT"
.IX Header "STANDARDS DOCUMENT"
.SS "Title"
.IX Subsection "Title"
.Vb 4
\&    ISO8601:2000(E)
\&    Data elements and interchange formats \- information exchange \-
\&    Representation of dates and times
\&    Second edition 2000\-12\-15
.Ve
.SS "Reference Number"
.IX Subsection "Reference Number"
.Vb 1
\&    ISO/TC 154 N 362
.Ve
.SH "CREDITS"
.IX Header "CREDITS"
Iain 'Spoon' Truskett (\s-1SPOON\s0) who wrote DateTime::Format::Builder. That has
grown into \fIThe Vacuum Energy Powered \f(CI\*(C`Swiss Army\*(C'\fI Katana\fR of date and time
parsing. This module was inspired by and conceived in honor of Iain's work.
.PP
Tom Phoenix (\s-1PHOENIX\s0) and \s-1PDX\s0.pm for helping me solve the \s-1ISO\s0 week conversion
bug. Not by fixing the code but motivation me to fix it so I could participate
in a game of \f(CW\*(C`Zendo\*(C'\fR.
.PP
Jonathan Leffler (\s-1JOHNL\s0) for reporting a test bug.
.PP
Kelly McCauley for a patch to add 8 missing formats.
.PP
Alasdair Allan (\s-1AALLAN\s0) for complaining about excessive test execution time.
.PP
Everyone at the DateTime \f(CW\*(C`Asylum\*(C'\fR.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
.IP "\(bu" 4
DateTime
.IP "\(bu" 4
DateTime::Format::Builder
.SH "SUPPORT"
.IX Header "SUPPORT"
Bugs may be submitted at <https://github.com/houseabsolute/DateTime\-Format\-ISO8601/issues>.
.PP
I am also usually active on \s-1IRC\s0 as 'autarch' on \f(CW\*(C`irc://irc.perl.org\*(C'\fR.
.SH "SOURCE"
.IX Header "SOURCE"
The source code repository for DateTime\-Format\-ISO8601 can be found at <https://github.com/houseabsolute/DateTime\-Format\-ISO8601>.
.SH "AUTHORS"
.IX Header "AUTHORS"
.IP "\(bu" 4
Joshua Hoblitt <josh@hoblitt.com>
.IP "\(bu" 4
Dave Rolsky <autarch@urth.org>
.SH "CONTRIBUTORS"
.IX Header "CONTRIBUTORS"
.IP "\(bu" 4
Doug Bell <doug@preaction.me>
.IP "\(bu" 4
joe <draxil@gmail.com>
.IP "\(bu" 4
Liam Widdowson <lbw@telstra.com>
.IP "\(bu" 4
Thomas Klausner <domm@plix.at>
.SH "COPYRIGHT AND LICENSE"
.IX Header "COPYRIGHT AND LICENSE"
This software is copyright (c) 2021 by Joshua Hoblitt.
.PP
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.
.PP
The full text of the license can be found in the
\&\fI\s-1LICENSE\s0\fR file included with this distribution.