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<?php |
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namespace Tworzenieweb\CyclicDates; |
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use DateTime; |
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/** |
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* Use this class for estimating events occuring on every month. For example having an estimation |
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* of event occuring for every month in 2 weeks interval is as simple as |
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* RepetitiveDateEstimator::build(new DateTime(), RepeatitiveInterval::twoWeeks()) |
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* This will show 2 dates for each month one scheduled for 15th and second for 29th |
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* |
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* @package Tworzenieweb\CyclicDates |
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*/ |
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class RepetitiveDateEstimator |
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{ |
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/** |
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* @var DateTime |
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*/ |
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private $referenceDate; |
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/** |
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* @var RepetitiveInterval |
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*/ |
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private $interval; |
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/** |
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* @param DateTime $referenceDate |
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* @param RepetitiveInterval $interval |
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*/ |
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private function __construct(DateTime $referenceDate, RepetitiveInterval $interval) |
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{ |
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$this->referenceDate = $referenceDate; |
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$this->interval = $interval; |
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} |
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/** |
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* @param DateTime $referenceDate |
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* @param RepetitiveInterval $interval |
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* |
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* @return RepetitiveDateEstimator |
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*/ |
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public static function build(DateTime $referenceDate, RepetitiveInterval $interval) |
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{ |
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$repetitiveDateEstimator = new self($referenceDate, $interval); |
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return $repetitiveDateEstimator; |
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} |
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/** |
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* @return DateTime |
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*/ |
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public function getNextDate() |
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{ |
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$referenceWithoutTime = clone $this->referenceDate; |
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$dayOfMonth = (int)$referenceWithoutTime->format('j'); |
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$repetitiveInterval = $this->interval->interval(); |
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$moduloInterval = $dayOfMonth % $repetitiveInterval; |
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if ($moduloInterval === 0) { |
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$daysToAdd = 1; |
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} else { |
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$daysToAdd = $repetitiveInterval - ($moduloInterval); |
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$daysInCurrentMonth = (int)$referenceWithoutTime->format('t'); |
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if ($dayOfMonth + $daysToAdd >= $daysInCurrentMonth) { |
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$daysToAdd += ($daysInCurrentMonth - $dayOfMonth - ($daysToAdd - $repetitiveInterval)); |
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} |
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$daysToAdd++; |
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} |
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$nextDate = clone $referenceWithoutTime; |
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$nextDate->modify(sprintf('+ %d days', $daysToAdd)); |
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return $nextDate; |
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} |
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} |
tworzenieweb /
repetitive-date-estimator
