package Calendar::Bahai;
$Calendar::Bahai::VERSION = '0.08';
use strict; use warnings;
=head1 NAME
Calendar::Bahai - Interface to the calendar used by Bahai faith.
=head1 VERSION
Version 0.08
=cut
use Data::Dumper;
use POSIX qw/floor/;
use Time::localtime;
use List::Util qw/min/;
use Date::Calc qw/Delta_Days Day_of_Week Add_Delta_Days/;
my $BAHAI_EPOCH = 2394646.5;
my $GREGORIAN_EPOCH = 1721425.5;
my $MONTHS = [
'',
'Baha', 'Jalal', 'Jamal', 'Azamat', 'Nur', 'Rahmat',
'Kalimat', 'Kamal', 'Asma', 'Izzat', 'Mashiyyat', 'Ilm',
'Qudrat', 'Qawl', 'Masail', 'Sharaf', 'Sultan', 'Mulk',
'Ala' ];
my $CYCLES = [
'',
'Alif', 'Ba', 'Ab', 'Dal', 'Bab', 'Vav',
'Abad', 'Jad', 'Baha', 'Hubb', 'Bahhaj', 'Javab',
'Ahad', 'Vahhab', 'Vidad', 'Badi', 'Bahi', 'Abha',
'Vahid' ];
my $DAYS = [
'Jamal', 'Kamal', 'Fidal', 'Idal',
'Istijlal', 'Istiqlal', 'Jalal' ];
sub new {
my ($class, $yyyy, $mm, $dd) = @_;
my ($major, $cycle);
my $self = {};
bless $self, $class;
if (defined($yyyy) && defined($mm) && defined($dd)) {
_validate_date($yyyy, $mm, $dd);
($major, $cycle, $yyyy) = _get_major_cycle_year($yyyy-1);
}
else {
my $today = localtime;
$yyyy = ($today->year+1900) unless defined $yyyy;
$mm = ($today->mon+1) unless defined $mm;
$dd = $today->mday unless defined $dd;
($major, $cycle, $yyyy, $mm, $dd) = $self->from_gregorian($yyyy, $mm, $dd);
}
$self->{major} = $major;
$self->{cycle} = $cycle;
$self->{yyyy} = $yyyy;
$self->{mm} = $mm;
$self->{dd} = $dd;
return $self;
}
=head1 SYNOPSIS
The Bahai calendar started from the original Badi calendar, created by the Bab.
The Bahai calendar is composed of 19 months, each with 19 days. Years in the
Bahai calendar are counted from Thursday, 21 March 1844, the beginning of the
Bahai Era or Badi Era (abbreviated BE or B.E.). Year 1 BE thus began at sundown
20 March 1844. Using the Bahai names for the weekday and month, day one of the
Bahai Era was Istijlal (Majesty), 1 Baha (Splendour) 1 BE.
=head2 Bahai Calendar for the month of Baha year 168 BE.
Baha [168 BE]
Sun Mon Tue Wed Thu Fri Sat
1 2 3 4 5 6
7 8 9 10 11 12 13
14 15 16 17 18 19
=head2 Months Names
Month Arabic Name English Translation Gregorian Dates
1 Baha Splendour 21 Mar - 08 Apr
2 Jalal Glory 09 Apr - 27 Apr
3 Jamal Beauty 28 Apr - 16 May
4 Azamat Grandeur 17 May - 04 Jun
5 Nur Light 05 Jun - 23 Jun
6 Rahmat Mercy 24 Jun - 12 Jul
7 Kalimat Words 13 Jul - 31 Jul
8 Kamal Perfection 01 Aug - 19 Aug
9 Asma Names 20 Aug - 07 Sep
10 Izzat Might 08 Sep - 26 Sep
11 Mashiyyat Will 27 Sep - 15 Oct
12 Ilm Knowledge 16 Oct - 03 Nov
13 Qudrat Power 04 Nov - 22 Nov
14 Qawl Speech 23 Nov - 11 Dec
15 Masail Questions 12 Dec - 30 Dec
16 Sharaf Honour 31 Dec - 18 Jan
17 Sultan Sovereignty 19 Jan - 06 Feb
18 Mulk Dominion 07 Feb - 25 Feb
Ayyam-i-Ha The Days of Ha 26 Feb - 01 Mar
19 Ala Loftiness 02 Mar - 20 Mar (Month of fasting)
=head2 Weekdays
Arabic Name English Translation Day of the Week
Jalal Glory Saturday
Jamal Beauty Sunday
Kamal Perfection Monday
Fidal Grace Tuesday
Idal Justice Wednesday
Istijlal Majesty Thursday
Istiqlal Independence Friday
=head2 Kull-i-Shay and Vahid
Also existing in the Bahai calendar system is a 19-year cycle called Vahid and a
361-year (19x19) supercycle called Kull-i-Shay (literally, "All Things"). Each of
the 19 years in a Vahid has been given a name as shown in the table below.The 9th
Vahid of the 1st Kull-i-Shay started on 21 March 1996, and the 10th Vahid will
begin in 2015. The current Bahai year,year 168 BE (21 March 2011 - 20 March 2012)
, is year Badi of the 9th Vahid of the 1st Kull-i-Shay. The 2nd Kull-i-Shay will
begin in 2205.
=head2 1st Kull-i-Shay
No. Name Meaning 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
1 Alif A 1844 1863 1882 1901 1920 1939 1958 1977 1996 2015 2034 2053 2072 2091 2110 2129 2148 2167 2186
2 Ba B 1845 1864 1883 1902 1921 1940 1959 1978 1997 2016 2035 2054 2073 2092 2111 2130 2149 2168 2187
3 Ab Father 1846 1865 1884 1903 1922 1941 1960 1979 1998 2017 2036 2055 2074 2093 2112 2131 2150 2169 2188
4 Dal D 1847 1866 1885 1904 1923 1942 1961 1980 1999 2018 2037 2056 2075 2094 2113 2132 2151 2170 2189
5 Bab Gate 1848 1867 1886 1905 1924 1943 1962 1981 2000 2019 2038 2057 2076 2095 2114 2133 2152 2171 2190
6 Vav V 1849 1868 1887 1906 1925 1944 1963 1982 2001 2020 2039 2058 2077 2096 2115 2134 2153 2172 2191
7 Abad Eternity 1850 1869 1888 1907 1926 1945 1964 1983 2002 2021 2040 2059 2078 2097 2116 2135 2154 2173 2192
8 Jad Generosity 1851 1870 1889 1908 1927 1946 1965 1984 2003 2022 2041 2060 2079 2098 2117 2136 2155 2174 2193
9 Baha Splendour 1852 1871 1890 1909 1928 1947 1966 1985 2004 2023 2042 2061 2080 2099 2118 2137 2156 2175 2194
10 Hubb Love 1853 1872 1891 1910 1929 1948 1967 1986 2005 2024 2043 2062 2081 2100 2119 2138 2157 2176 2195
11 Bahhaj Delightful 1854 1873 1892 1911 1930 1949 1968 1987 2006 2025 2044 2063 2082 2101 2120 2139 2158 2177 2196
12 Javab Answer 1855 1874 1893 1912 1931 1950 1969 1988 2007 2026 2045 2064 2083 2102 2121 2140 2159 2178 2197
13 Ahad Single 1856 1875 1894 1913 1932 1951 1970 1989 2008 2027 2046 2065 2084 2103 2122 2141 2160 2179 2198
14 Vahhab Bountiful 1857 1876 1895 1914 1933 1952 1971 1990 2009 2028 2047 2066 2085 2104 2123 2142 2161 2180 2199
15 Vidad Affection 1858 1877 1896 1915 1934 1953 1972 1991 2010 2029 2048 2067 2086 2105 2124 2143 2162 2181 2200
16 Badi Beginning 1859 1878 1897 1916 1935 1954 1973 1992 2011 2030 2049 2068 2087 2106 2125 2144 2163 2182 2201
17 Bahi Luminous 1860 1879 1898 1917 1936 1955 1974 1993 2012 2031 2050 2069 2088 2107 2126 2145 2164 2183 2202
18 Abha Most Luminous 1861 1880 1899 1918 1937 1956 1975 1994 2013 2032 2051 2070 2089 2108 2127 2146 2165 2184 2203
19 Vahid Unity 1862 1881 1900 1919 1938 1957 1976 1995 2014 2033 2052 2071 2090 2109 2128 2147 2166 2185 2204
=head1 METHODS
=head2 as_string()
Return Bahai date in human readable format.
use strict; use warnings;
use Calendar::Bahai;
my $calendar = Calendar::Bahai->new();
print "Bahai date is " . $calendar->as_string() . "\n";
=cut
sub as_string {
my ($self) = @_;
my $yyyy = $self->{major} * (19 * ($self->{cycle} - 1) + $self->{yyyy});
return sprintf("%02d, %s %d BE", $self->{dd}, $MONTHS->[$self->{mm}], $yyyy);
}
=head2 today()
Return today's date in Bahai calendar as list in the format major, cycle, yyyy,
mm and dd.
use strict; use warnings;
use Calendar::Bahai;
my $calendar = Calendar::Bahai->new();
my ($major, $cycle, $yyyy, $mm, $dd) = $bahai->today();
print "Major [$major] Cycle [$cycle] Year [$yyyy] Month [$mm] Day [$dd]\n";
=cut
sub today {
my ($self) = @_;
my $today = localtime;
return $self->from_gregorian($today->year+1900, $today->mon+1, $today->mday);
}
=head2 dow(yyyy, mm, dd)
Get day of the week of the given Bahai date, starting with sunday (0).
use strict; use warnings;
use Calendar::Bahai;
my $calendar = Calendar::Bahai->new();
print "Day of the week; [" . $calendar->dow() . "]\n";
=cut
sub dow {
my ($self, $yyyy, $mm, $dd) = @_;
$yyyy = $self->{yyyy} unless defined $yyyy;
$mm = $self->{mm} unless defined $mm;
$dd = $self->{dd} unless defined $dd;
_validate_date($yyyy, $mm, $dd);
my ($major, $cycle);
($major, $cycle, undef) = _get_major_cycle_year($yyyy);
my @gregorian = $self->to_gregorian($major, $cycle, $yyyy, $mm, $dd);
return Day_of_Week(@gregorian);
}
=head2 get_calendar(yyyy, mm)
Return calendar for given year and month in Bahai calendar.It return current month
of Bahai calendar if no argument is passed in.
use strict; use warnings;
use Calendar::Bahai;
my $calendar = Calendar::Bahai->new();
print $saka->get_calendar();
# Print calendar for year 168 and month 1.
print $saka->get_calendar(168, 1);
=cut
sub get_calendar {
my ($self, $yyyy, $mm) = @_;
my ($major, $cycle, $year);
my ($calendar, $start_index, $days);
if (defined($yyyy) && defined($mm)) {
_validate_date($yyyy, $mm, 1);
$calendar = sprintf("\n\t%s [%d BE]\n", $MONTHS->[$mm], $yyyy);
}
else {
$yyyy = $self->{major} * (19 * ($self->{cycle} - 1) + $self->{yyyy});
$calendar = sprintf("\n\t%s [%d BE]\n", $MONTHS->[$self->{mm}], $yyyy);
$mm = $self->{mm};
}
$calendar .= "\nSun Mon Tue Wed Thu Fri Sat\n";
$start_index = $self->dow($yyyy, $mm, 1);
map { $calendar .= " " } (1..($start_index%=7));
foreach (1 .. 19) {
$calendar .= sprintf("%3d ", $_);
$calendar .= "\n" unless (($start_index+$_)%7);
}
return sprintf("%s\n\n", $calendar);
}
=head2 from_gregorian(yyyy, mm, dd)
Convert Gregorian date to Bahai date.
use strict; use warnings;
use Calendar::Bahai;
my $calendar = Calendar::Bahai->new();
my ($major, $cycle, $yyyy, $mm, $dd) = $calendar->from_gregorian(2011, 3, 25);
=cut
sub from_gregorian {
my ($self, $yyyy, $mm, $dd) = @_;
return $self->from_julian(_gregorian_to_julian($yyyy, $mm, $dd));
}
=head2 to_gregorian()
Convert Bahai date to Gregorian date.
use strict; use warnings;
use Calendar::Bahai;
my $calendar = Calendar::Bahai->new();
my ($yyyy, $mm, $dd) = $calendar->to_gregorian();
=cut
sub to_gregorian {
my ($self, $major, $cycle, $yyyy, $mm, $dd) = @_;
$major = $self->{major} unless defined $major;
$cycle = $self->{cycle} unless defined $cycle;
$yyyy = $self->{yyyy} unless defined $yyyy;
$mm = $self->{mm} unless defined $mm;
$dd = $self->{dd} unless defined $dd;
return _julian_to_gregorian($self->to_julian($major, $cycle, $yyyy, $mm, $dd));
}
=head2 from_julian()
Convert Julian date to Bahai date.
use strict; use warnings;
use Calendar::Bahai;
my $calendar = Calendar::Bahai->new();
my ($major, $cycle, $yyyy, $mm, $dd) = $calendar->from_julian(2400124.5);
=cut
sub from_julian {
my ($self, $julian) = @_;
my ($major, $cycle, $yyyy, $mm, $dd);
my ($gy, $bstarty, $j1, $j2, $bys, $bld);
$julian = floor($julian) + 0.5;
($gy) = _julian_to_gregorian($julian);
($bstarty) = _julian_to_gregorian($BAHAI_EPOCH);
$j1 = _gregorian_to_julian($gy, 1, 1);
$j2 = _gregorian_to_julian($gy, 3, 20);
$bys = $gy - ($bstarty + ((($j1 <= $julian) && ($julian <= $j2)) ? 1 : 0));
($major, $cycle, $yyyy) = _get_major_cycle_year($bys);
$dd = $julian - $self->to_julian($major, $cycle, $yyyy, 1, 1);
$bld = $self->to_julian($major, $cycle, $yyyy, 20, 1);
$mm = ($julian >= $bld) ? 20 : (floor($dd / 19) + 1);
$dd = ($julian + 1) - $self->to_julian($major, $cycle, $yyyy, $mm, 1);
return ($major, $cycle, $yyyy, $mm, $dd);
}
=head2 to_julian(major, cycle, yyyy, mm, dd)
Convert Bahai date to Julian date.
use strict; use warnings;
use Calendar::Bahai;
my $calendar = Calendar::Bahai->new();
my $julian = $calendar->to_julian();
=cut
sub to_julian {
my ($self, $major, $julian, $cycle, $yyyy, $mm, $dd) = @_;
$major = $self->{major} unless defined $major;
$cycle = $self->{cycle} unless defined $cycle;
$yyyy = $self->{yyyy} unless defined $yyyy;
$mm = $self->{mm} unless defined $mm;
$dd = $self->{dd} unless defined $dd;
my ($y) = _julian_to_gregorian($BAHAI_EPOCH);
my $gy = (361 * ($major - 1)) + (19 * ($cycle - 1)) + ($yyyy - 1) + $y;
return _gregorian_to_julian($gy, 3, 20)
+
(19 * ($mm - 1))
+
(($mm != 20) ? 0 : (_is_gregorian_leap($gy + 1) ? -14 : -15))
+
$dd;
}
sub _gregorian_to_julian {
my ($yyyy, $mm, $dd) = @_;
return ($GREGORIAN_EPOCH - 1) +
(365 * ($yyyy - 1)) +
floor(($yyyy - 1) / 4) +
(-floor(($yyyy - 1) / 100)) +
floor(($yyyy - 1) / 400) +
floor((((367 * $mm) - 362) / 12) +
(($mm <= 2) ? 0 : (_is_gregorian_leap($yyyy) ? -1 : -2)) +
$dd);
}
sub _julian_to_gregorian {
my ($julian) = @_;
my $wjd = floor($julian - 0.5) + 0.5;
my $depoch = $wjd - $GREGORIAN_EPOCH;
my $quadricent = floor($depoch / 146097);
my $dqc = $depoch % 146097;
my $cent = floor($dqc / 36524);
my $dcent = $dqc % 36524;
my $quad = floor($dcent / 1461);
my $dquad = $dcent % 1461;
my $yindex = floor($dquad / 365);
my $year = ($quadricent * 400) + ($cent * 100) + ($quad * 4) + $yindex;
$year++ unless (($cent == 4) || ($yindex == 4));
my $yearday = $wjd - _gregorian_to_julian($year, 1, 1);
my $leapadj = (($wjd < _gregorian_to_julian($year, 3, 1)) ? 0 : ((_is_gregorian_leap($year) ? 1 : 2)));
my $month = floor(((($yearday + $leapadj) * 12) + 373) / 367);
my $day = ($wjd - _gregorian_to_julian($year, $month, 1)) + 1;
return ($year, $month, $day);
}
sub _get_major_cycle_year {
my ($bys) = @_;
my $major = floor($bys / 361) + 1;
my $cycle = floor(($bys % 361) / 19) + 1;
my $yyyy = ($bys % 19) + 1;
return ($major, $cycle, $yyyy);
}
sub _is_gregorian_leap {
my ($yyyy) = @_;
return (($yyyy % 4) == 0) &&
(!((($yyyy % 100) == 0) && (($yyyy % 400) != 0)));
}
sub _validate_date {
my ($yyyy, $mm, $dd) = @_;
die("ERROR: Invalid year [$yyyy].\n")
unless (defined($yyyy) && ($yyyy =~ /^\d+$/) && ($yyyy > 0));
die("ERROR: Invalid month [$mm].\n")
unless (defined($mm) && ($mm =~ /^\d{1,2}$/) && ($mm >= 1) && ($mm <= 19));
die("ERROR: Invalid day [$dd].\n")
unless (defined($dd) && ($dd =~ /^\d{1,2}$/) && ($dd >= 1) && ($dd <= 19));
}
=head1 AUTHOR
Mohammad S Anwar, C<< <mohammad.anwar at yahoo.com> >>
=head1 REPOSITORY
L<https://github.com/Manwar/Calendar-Bahai>
=head1 BUGS
Please report any bugs / feature requests to C<bug-calendar-bahai at rt.cpan.org>,
or through the web interface at L<http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Calendar-Bahai>.
I will be notified, and then you'll automatically be notified of progress on your
bug as I make changes.
=head1 SUPPORT
You can find documentation for this module with the perldoc command.
perldoc Calendar::Bahai
You can also look for information at:
=over 4
=item * RT: CPAN's request tracker
L<http://rt.cpan.org/NoAuth/Bugs.html?Dist=Calendar-Bahai>
=item * AnnoCPAN: Annotated CPAN documentation
L<http://annocpan.org/dist/Calendar-Bahai>
=item * CPAN Ratings
L<http://cpanratings.perl.org/d/Calendar-Bahai>
=item * Search CPAN
L<http://search.cpan.org/dist/Calendar-Bahai/>
=back
=head1 LICENSE AND COPYRIGHT
Copyright 2011 - 2014 Mohammad S Anwar.
This program is free software; you can redistribute it and/or modify it under
the terms of the the Artistic License (2.0). You may obtain a copy of the full
license at:
L<http://www.perlfoundation.org/artistic_license_2_0>
Any use, modification, and distribution of the Standard or Modified Versions is
governed by this Artistic License.By using, modifying or distributing the Package,
you accept this license. Do not use, modify, or distribute the Package, if you do
not accept this license.
If your Modified Version has been derived from a Modified Version made by someone
other than you,you are nevertheless required to ensure that your Modified Version
complies with the requirements of this license.
This license does not grant you the right to use any trademark, service mark,
tradename, or logo of the Copyright Holder.
This license includes the non-exclusive, worldwide, free-of-charge patent license
to make, have made, use, offer to sell, sell, import and otherwise transfer the
Package with respect to any patent claims licensable by the Copyright Holder that
are necessarily infringed by the Package. If you institute patent litigation
(including a cross-claim or counterclaim) against any party alleging that the
Package constitutes direct or contributory patent infringement,then this Artistic
License to you shall terminate on the date that such litigation is filed.
Disclaimer of Warranty: THE PACKAGE IS PROVIDED BY THE COPYRIGHT HOLDER AND
CONTRIBUTORS "AS IS' AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES. THE IMPLIED
WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR
NON-INFRINGEMENT ARE DISCLAIMED TO THE EXTENT PERMITTED BY YOUR LOCAL LAW. UNLESS
REQUIRED BY LAW, NO COPYRIGHT HOLDER OR CONTRIBUTOR WILL BE LIABLE FOR ANY DIRECT,
INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING IN ANY WAY OUT OF THE USE
OF THE PACKAGE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
=cut
1; # End of Calendar::Bahai