<?php
/**
* @file
* Converts date from Gregorian to theAbysmal Calendar
* 
* theAbysmal Calendar in depth: http://theabysmal.wordpress.com/theabysmal-calendar/
* Currently uses months from the Tranquility Calendar 
* (http://www.mithrandir.com/tranquility/tranquility.html) and days in
* highly informal/bastardised lojban as that's how I use it.
* 
* @author ryivhnn
*/

/**
* Implements hook_help.
*
* Displays help and module information.
*
* @param path
*   Which path of the site we're using to display help
* @param arg
*   Array that holds the current path as returned from arg() function
*/

function theabysmal_calendar_help($path, $arg) {
switch ($path) {
    case "admin/help#theabysmal_calendar" :
    return '<p>' . t("Converts date to theAbysmal Calendar") . '</p><p>&nbsp;</p><p>';
    break; 
    } 
} 

function node_created_date() { 
    // grab node create date 
    $query = db_select('node', 'n') -> fields('n', array('nid', 'created')) -> condition('nid', arg(1)) -> condition('status', 1) -> execute() -> fetchAssoc(); 
    $date = $query['created']; 
    return $date; 
} 

function today() { 
    // grab today's date 
    $date = time(); 
    return $date; 
} 

function date_converter($date_ce) { 
/** 
    * doing the calendar converty magic 
    * owe the algorithm to the software engineer husband 
    */
    
// set the zero date and time for theAbysmal Calendar 
$zero_date = mktime(0, 0, 0, 12, 21, 2012); 

// this is New Year Day on theAbysmal Calendar 
$zero_day = date('z', mktime(0, 0, 0, 12, 22, 2012)); 

// this is first day which is counted from 0 
// calculate theAbysmal year 
if ((date('m', $date_ce) == 12) && (date('d', $date_ce) > 20)) { 
    $year = date('Y', $date_ce) - date('Y', $zero_date); 
} 
else { 
    $year = (date('Y', $date_ce) - date('Y', $zero_date)) - 1; 
} 

/** 
    * I think theAbysmal Calendar may be following Gregorian leap years to a degree. 
    * I couldn't find anything explicit in the documentation on the website. 
    * Because it counts from 0 every 4th number ends up being slightly weird (3, 7, 11, 15). 
    * I've decided to modify slightly to make leap years occur on multiples of 4 like they do 
    * on the Gregorian which then makes the not observing the leap year every 128 years 
    * slightly easy to remember, and also takes an operator out of the maths. 
    * Yes I can write an entire rationale in the comments but cbf putting in one extra operator. 
    */ 

if ($year % 4 == 0) { 
    $ly = 1; 
    
    if ($year % 128 == 0) 
    { $ly = 0; 
    } 
} 
else { 
    $ly = 0; 
} 

// because the leap years are different, we need to do maths with Gregorian 
$gly = date('L', $date_ce); 

// "buffers" for the leap year calculations 
if ($ly == 0 && $gly == 0) { 
    /** 
        * the way the $year_length calculation works, years where it's not a Gregorian 
        * or theAbysmal leap year come up a bit short, so this pads it out 
        */ 
        
    $leap_buffer = 1; 
}
elseif ($ly == 1 &amp;&amp; $gly == 1) { 
    /** 
        * conversely if the leap years coincide it makes the $year_length a bit longer 
        * than it should be, so this adjusts 
        */ 
        
    $leap_buffer = -1; 
} 
else { 
    $leap_buffer = 0; 
} 

/** 
    * working out how long the year is 
    * need to +1 to make it an absolute value 
    * add theAbysmal leap year and subtract the Gregorian leap year as required 
    */ 
    
$year_length = date('z', mktime(0, 0, 0, 12, 31, $year_ce)) + $ly - $gly + $leap_buffer + 1; 

// what day number are we up to in the Gregorian, + theAbysmal leap year + the leap buffer 
$gregorian_day_of_year = date('z', $date_ce) + $ly + $leap_buffer; 

// how many days have passed since theAbysmal start date, plus tA leap year day, less Gregorian leap year day 
$days_from_start = ($gregorian_day_of_year - $zero_day + $year_length) % $year_length; 

// theAbysmal month converted to an integer 
$month_number = intval($days_from_start / 28); 

// what day in the month it is 
$mday = $days_from_start % 28; 

// lojban day names assigned to month names 
$days = array( 
    'xundei' => array('0', '7', '14', '21'), 
    'najdei' => array('1', '8', '15', '22'), 
    'peldei' => array('2', '9', '16', '23'), 
    'ri\'ordei' => array('3', '10', '17', '24'), 
    'cicnydei' => array('4', '11', '18', '25'), 
    'bladei' => array('5', '12', '19', '26'), 
    'zirdei' => array('6', '13', '20', '27'), 
); 

foreach($days as $key =&gt; $value) {
    if (in_array($mday, $value)) { 
        $weekday = $key; 
    } 
} 

// Tranquility calendar month names 
// the 14th "month" is a 2 day intercalary period for New Year Day and Leap Year Day 
$months = array( 
    '0' => 'Archimedes',
    '1' => 'Brahe',
    '2' => 'Copernicus', 
    '3' => 'Darwin',
    '4' => 'Einstein', 
    '5' => 'Faraday',
    '6' => 'Galileo', 
    '7' => 'Hippocrates',
    '8' => 'Imhotep', 
    '9' => 'Jung', 
    '10' => 'Kepler', 
    '11' => 'Lavoisier', 
    '12' => 'Mendel', 
    '13' => '', 
); 

foreach ($months as $key =&gt; $value) { 
    if ($key == $month_number) { 
        $month = $value; 
    } 
} 

/* 
    * intercalary days 
    * 
    * check to see if it's December Solstice (Dec 21) 
    * if it is, it's New Year Day 
    * if not, it's a weekday 
    * 
    * if it's a leap year, Dec 20 is Leap Year Day 
    */
    
if ($month == '') { 
    $weekday = ''; 
    
    if (date('d', $date_ce) == 21 && date('m', $date_ce) == 12) { 
        $mday = "New Year Day"; 
    } 
    
    if ($ly == 1 && date('d', $date_ce) == 20 && date('m', $date_ce) == 12) { 
        $mday = "Leap Day"; 
    } 
} 

// leading zero silliness 
$yrabs = abs($year); 
$yrlen = strlen($yrabs); 

if ($date_ce < $zero_date) { 
    $era = 'btAT'; 
} 
elseif ($year == '0000') { 
    $era = 'tAT'; 
} 
else { 
    $era = 'tAT'; 
} 

if ($yrlen == 1) { 
    $year = '000' . $yrabs; 
} 
elseif ($yrlen == 2) { 
    $year = '00' . $yrabs; 
} 
elseif ($yrlen == 3) { 
    $year = '0' . $yrabs; 
} 

$daylen = strlen($mday); 

    if ($daylen == 1) { 
        $mday = '0' . $mday; 
    } 

    return $year . $era . ' ' . $month . ' ' . $mday . ' ' . $weekday; 
}

function date_shorten($date) { 
    /** 
     * can't help but feel this may be unnecessarily long winded :) 
     * 
     * Months and days are put into an array 
     * the first letter in each is grabbed 
     * the $date string is searched and the full name replaced with the letter 
     * then spaces are stripped 
     * 
     * I also continued with negative years in the array even though Not Jack 
     * isn't a huge fan og negative years as the $era was making my short dates 
     * longer :) 
     */
     
    if ($era = 'btAT') { 
        $neg = '-'; 
    } 
    
    $month = array( 
        'Archimedes', 
        'Brahe', 
        'Copernicus', 
        'Darwin', 
        'Einstein', 
        'Faraday', 
        'Galileo', 
        'Hippocrates', 
        'Imhotep', 
        'Jung', 
        'Kepler', 
        'Lavoisier', 
        'Mendel', 
    ); 
    
    foreach ($month as $value) { 
        $m = $value[0]; 
        $date = str_replace($value, $m, $date); 
    } 
    
    $wday = array( 
        'xundei', 
        'najdei', 
        'peldei', 
        'ri\'ordei', 
        'cicnydei', 
        'bladei', 
        'zirdei', 
    ); 
    
    foreach ($wday as $value) { 
        $wd = $value[0]; 
        $date = str_replace($value, $wd, $date); 
    } 
    
    $date = str_replace(' ', '', $date); 
    $date = str_replace('btAT', '', $date); 
    
    return $neg . $date; 
}

/** 
 * implements hook_block_info() 
 */
 
 function theabysmal_calendar_block_info() { 
    $blocks['today'] = array( 
        'info' => t('Today\'s theAbysmal date'), 
        'cache' => DRUPAL_NO_CACHE, 
    ); 
    
    $blocks['posted'] = array( 
        'info' => t('Converted post date'), 
    ); 
    
    return $blocks;
}

/** 
 * implements hook_block_view() 
 */ 
 
 function theabysmal_calendar_block_view($delta = '') { 
    $block = array(); 
    
    switch ($delta) { 
        case 'today': $block['subject'] = t('Today\'s theAbysmal date'); 
            if (user_access('access content')) { 
                $date_ce = today(); 
                $block['content'] = date_converter($date_ce); 
            } 
        break; 
        case 'posted': $block['subject'] = t('Converted post date'); 
            if (user_access('access content')) { 
                $date_ce = node_created_date(); 
                $date = date_converter($date_ce); 
                $block['content'] = date_shorten($date); 
            } 
        break; 
    } 
    
    return $block; 
}
?>