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<?php |
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namespace Andegna\Holiday; |
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use Andegna\Converter\FromJdnConverter; |
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use Andegna\DateTimeFactory; |
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use DateTimeZone; |
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/** |
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* Ethiopian Easter. |
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*/ |
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class Easter |
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{ |
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/** @var DateTimeZone */ |
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private $dateTimeZone; |
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/** |
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* Easter constructor. |
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* |
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* @param DateTimeZone $dateTimeZone |
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*/ |
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public function __construct(DateTimeZone $dateTimeZone = null) |
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{ |
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$this->dateTimeZone = $dateTimeZone; |
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} |
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/** |
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* Get the easter date of a given Ethiopian year. |
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* |
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* @param $year int Ethiopian year |
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* |
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* @return \Andegna\DateTime |
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*/ |
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public function get(int $year) |
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{ |
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// convert the Ethiopian year to a Julian year |
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// ሚያዝያ 1 is just a random day after the Gregorian new year |
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$julian_year = (int) DateTimeFactory::of($year, 8, 1) |
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->toGregorian()->format('Y'); |
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// get the number of days from vernal equinox to the Easter in the given Julian year |
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$days_after = easter_days($julian_year, CAL_EASTER_ALWAYS_JULIAN); |
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// get the JDN of vernal equinox (March 21) in the given Julian year |
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$jdn = juliantojd(3, 21, $julian_year); |
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// add the number of days to Easter |
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$jdn += $days_after; |
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// create a Ethiopian Date to JDN converter |
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$con = new FromJdnConverter($jdn); |
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// create an Ethiopian date from the converter |
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return DateTimeFactory::of($con->getYear(), $con->getMonth(), $con->getDay(), |
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0, 0, 0, $this->dateTimeZone); |
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} |
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} |
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andegna /
calender
