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<?php |
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namespace Andegna; |
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/** |
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* Class Calender <br /> |
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* A set of functions to convert ethiopian date to JDN and vise versa. |
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*/ |
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class Calender |
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{ |
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/** |
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* Return a true if the year is a leap year based on the ethiopian calendar. |
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* |
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* @param int $year the ethiopian date to be checked |
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* |
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* @return bool |
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*/ |
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public static function isEthiopianLeapYear($year) |
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{ |
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if (!is_int($year)) { |
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trigger_error( |
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'isEthiopianLeapYear() expects parameter 1 to be numeric. '. |
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gettype($year).' given', |
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E_USER_WARNING |
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); |
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} |
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return ($year + 1) % 4 == 0; |
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} |
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/** |
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* Returns true if the <code>$month, $day and $year</code> passed |
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* are a valid date based on the ethiopian calendar. |
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* |
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* @param int $month Ethiopian month |
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* @param int $day Ethiopian day |
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* @param int $year Ethiopian year (negative for AD) |
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* |
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* @return bool |
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*/ |
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public static function ethiopianCheckDate($month, $day, $year) |
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{ |
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return |
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// validate all |
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is_int($month) && is_int($day) && is_int($year) && |
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// true if the day is btn 1 - 30 |
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($day <= 30 && $day >= 1) && |
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// true if the month is btn 1 - 13 |
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($month <= 13 && $month >= 1) && |
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// true if the month is 13 then day is btn 1 - 6 |
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($month == 13 ? $day <= 6 : true) && |
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// true if the month is 13 & day is 6 then year must be leap year |
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($month == 13 && $day == 6 ? |
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self::isEthiopianLeapYear($year) : true); |
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} |
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/** |
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* Returns the julian date number representation of the |
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* given ethiopian date. |
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* |
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* @param int $month Ethiopian month |
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* @param int $day Ethiopian day |
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* @param int $year Ethiopian year (negative for AD) |
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* |
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* @return int |
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*/ |
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public static function ethiopianToJd($month = 1, $day = 1, $year = 2000) |
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{ |
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if (!self::ethiopianCheckDate($month, $day, $year)) { |
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trigger_error( |
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'ethiopianToJd() expects the date to be valid.'. |
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' check ethiopianCheckDate() first', |
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E_USER_WARNING |
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); |
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} |
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return (1723856 + 365) + |
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365 * ($year - 1) + |
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(int) ($year / 4) + |
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30 * $month + |
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$day - 31; |
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} |
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/** |
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* Returns the ethiopian date string which is represented by |
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* the passed jdn <br />. |
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* |
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* @param int $jdn the Julian Date Number |
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* @param bool $array if this is true the function returns |
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* the day,month and year in associative array. |
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* |
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* @return array|string |
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*/ |
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public static function jdToEthiopian($jdn, $array = false) |
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{ |
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if (!is_int($jdn)) { |
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trigger_error( |
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'jdToEthiopian() expects parameter 1 to be numeric. '. |
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gettype($jdn).' given', |
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E_USER_WARNING |
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); |
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return self::jdToEthiopian(self::ethiopianToJd()); |
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} |
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$r = (($jdn - 1723856) % 1461); |
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$n = ($r % 365) + 365 * (int) ($r / 1460); |
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$year = 4 * (int) (($jdn - 1723856) / 1461) + |
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(int) ($r / 365) - (int) ($r / 1460); |
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$month = (int) ($n / 30) + 1; |
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$day = ($n % 30) + 1; |
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return ($array ? compact('day', 'month', 'year') : "$month/$day/$year"); |
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} |
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} |
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andegna /
calender
