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  1. <?php
  2.  
  3. $tz = new DateTimeZoneEx('America/New_York');
  4.  
  5. echo "\nTesting isValidTime:\n";
  6.  
  7. $dates = [
  8. 	'2013-03-10 01:59:59',
  9. 	'2013-03-10 02:00:00',
  10. 	'2013-03-10 02:59:59',
  11. 	'2013-03-10 03:00:00',
  12. ];
  13.  
  14. foreach ($dates as $date) {
  15. 	$result = $tz->isValidTime(new DateTime($date, $tz));
  16. 	echo "isValidTime($date) = ".($result ? "true" : "false")."\n";
  17. }
  18.  
  19. echo "\nTesting isAmbiguousTime:\n";
  20.  
  21. $dates = [
  22. 	'2013-11-03 00:59:59',
  23. 	'2013-11-03 01:00:00',
  24. 	'2013-11-03 01:59:59',
  25. 	'2013-11-03 02:00:00',
  26. ];
  27.  
  28. foreach ($dates as $date) {
  29. 	$result = $tz->isAmbiguousTime(new DateTime($date, $tz));
  30. 	echo "isAmbiguousTime($date) = ".($result ? "true" : "false")."\n";
  31. }
  32.  
  33.  
  34. class DateTimeZoneEx extends DateTimeZone
  35. {
  36.     const MAX_DST_SHIFT = 7200; // let's be generous
  37.  
  38.     public function isValidTime(DateTime $date)
  39.     {
  40.  
  41.         $ts = $date->getTimestamp();
  42.         $transitions = $this->getTransitions($ts - self::MAX_DST_SHIFT, $ts + self::MAX_DST_SHIFT);
  43.  
  44.         if (count($transitions) == 1) {
  45.             return true;
  46.         }
  47.  
  48.         $shift = $transitions[1]['offset'] - $transitions[0]['offset'];
  49.  
  50.         if ($shift < 0) {
  51.             return true;
  52.         }
  53.  
  54.         $compare = new DateTime($date->format('Y-m-d H:i:s'), $this);
  55.  
  56.         return $compare->modify("$shift seconds")->getTimestamp() != $ts;
  57.     }
  58.  
  59.     public function isAmbiguousTime(DateTime $date)
  60.     {
  61.         $ts = $date->getTimestamp();
  62.         $transitions = $this->getTransitions($ts - self::MAX_DST_SHIFT, $ts + self::MAX_DST_SHIFT);
  63.  
  64.         if (count($transitions) == 1) {
  65.             return false;
  66.         }
  67.  
  68.         $shift = $transitions[1]['offset'] - $transitions[0]['offset'];
  69.  
  70.         if ($shift > 0) {
  71.             return false;
  72.         }
  73.  
  74.         $shift = -$shift;
  75.         $compare = new DateTime($date->format('Y-m-d H:i:s'), $this);
  76.         return $compare->modify("$shift seconds")->getTimestamp() - $ts > $shift;
  77.     }
  78. }
  79.  
Success #stdin #stdout 0.01s 20568KB
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Standard input is empty
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Testing isValidTime:
isValidTime(2013-03-10 01:59:59) = true
isValidTime(2013-03-10 02:00:00) = false
isValidTime(2013-03-10 02:59:59) = false
isValidTime(2013-03-10 03:00:00) = true

Testing isAmbiguousTime:
isAmbiguousTime(2013-11-03 00:59:59) = false
isAmbiguousTime(2013-11-03 01:00:00) = true
isAmbiguousTime(2013-11-03 01:59:59) = true
isAmbiguousTime(2013-11-03 02:00:00) = false
https://ideone.com/orPTCp
language:
PHP (php 7.3.5)
created:
11 years ago
visibility:
public

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