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  1. <?php
  2.  
  3. $start = 1552211999;
  4. $dt = new DateTime('@'.$start);
  5. $dt->setTimezone(new DateTimeZone('America/Los_Angeles'));
  6. var_dump($dt);
  7. $dt->modify('+1 day');
  8. var_dump($dt);
Success #stdin #stdout 0s 82624KB
stdin
Standard input is empty
stdout
object(DateTime)#1 (3) {
  ["date"]=>
  string(26) "2019-03-10 01:59:59.000000"
  ["timezone_type"]=>
  int(3)
  ["timezone"]=>
  string(19) "America/Los_Angeles"
}
object(DateTime)#1 (3) {
  ["date"]=>
  string(26) "2019-03-11 01:59:59.000000"
  ["timezone_type"]=>
  int(3)
  ["timezone"]=>
  string(19) "America/Los_Angeles"
}