Created
March 25, 2012 16:26
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Calculate the last <blank> of the month
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<?php | |
class MyDateTime extends DateTime | |
{ | |
protected $_daysOfTheWeek = array('sunday', 'monday', 'tuesday', 'wednesday', 'thursday', 'friday', 'saturday'); | |
public function lastDayOfTheMonth() | |
{ | |
$lastDayOfTheMonth = new MyDateTime($this->format('Y-m-t'), $this->getTimezone()); | |
return $lastDayOfTheMonth; | |
} | |
public function lastWeekdayOfTheMonth($weekday) | |
{ | |
if (false === ($weekdayIndex = array_search(strtolower($weekday), $this->_daysOfTheWeek))) { | |
throw new Exception("Unknown weekday: " . $weekday); | |
} | |
$lastDayOfTheMonth = $this->lastDayOfTheMonth(); | |
$lastWeekday = clone $lastDayOfTheMonth; | |
if ($lastDayOfTheMonth->format('w') < $weekdayIndex) { | |
$lastWeekday->sub(new DateInterval('P7D')); | |
$daysUntil = $weekdayIndex - $lastDayOfTheMonth->format('w'); | |
$lastWeekday->add(new DateInterval(sprintf('P%dD', $daysUntil))); | |
} else if ($lastDayOfTheMonth->format('w') > $weekdayIndex) { | |
$daysSince = $lastDayOfTheMonth->format('w') - $weekdayIndex; | |
$lastWeekday->sub(new DateInterval(sprintf("P%dD", $daysSince))); | |
} | |
return $lastWeekday; | |
} | |
} | |
$today = new MyDateTime(null, new DateTimeZone('America/Toronto')); | |
$lastWednesday = $today->lastWeekdayOfTheMonth('wednesday'); | |
echo $lastWednesday->format('Y-m-d') . "\n"; | |
$april = new MyDateTime('2012-04-01', new DateTimeZone('America/Toronto')); | |
$lastWednesday = $april->lastWeekdayOfTheMonth('wednesday'); | |
echo $lastWednesday->format('Y-m-d') . "\n"; | |
$october = new MyDateTime('2012-10-01', new DateTimeZone('America/Toronto')); | |
$lastWednesday = $october->lastWeekdayOfTheMonth('wednesday'); | |
echo $lastWednesday->format('Y-m-d') . "\n"; | |
$september = new MyDateTime('2012-09-01', new DateTimeZone('America/Toronto')); | |
$lastSunday = $september->lastWeekdayOfTheMonth('sunday'); | |
echo $lastSunday->format('Y-m-d') . "\n"; |
Fair enough-I understand where you're coming from. I'll just keep performing my black magic. :)
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Abracadabra!
You're right, what you've got there works, but for me, and this is just my opinion, it's got way too much black magic going on. I'm just not a fan of using relative dates like 'yesterday' or 'tomorrow' with strtotime. I just prefer to explicitly modify datetime objects with add() and sub().