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<?php $baseDate = new DateTime('2017-01-01', new DateTimezone('UTC')); $endDate = clone $baseDate; for($i = 1; $i <= 10; ++$i) { $duration = new DateInterval("PT{$i}H"); $endDate = $baseDate->add($duration); var_dump($baseDate); var_dump($endDate); }
based on UieMd
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.0
object(DateTime)#1 (3) { ["date"]=> string(26) "2017-01-01 01:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(3) "UTC" } object(DateTime)#1 (3) { ["date"]=> string(26) "2017-01-01 01:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(3) "UTC" } object(DateTime)#1 (3) { ["date"]=> string(26) "2017-01-01 03:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(3) "UTC" } object(DateTime)#1 (3) { ["date"]=> string(26) "2017-01-01 03:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(3) "UTC" } object(DateTime)#1 (3) { ["date"]=> string(26) "2017-01-01 06:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(3) "UTC" } object(DateTime)#1 (3) { ["date"]=> string(26) "2017-01-01 06:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(3) "UTC" } object(DateTime)#1 (3) { ["date"]=> string(26) "2017-01-01 10:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(3) "UTC" } object(DateTime)#1 (3) { ["date"]=> string(26) "2017-01-01 10:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(3) "UTC" } object(DateTime)#1 (3) { ["date"]=> string(26) "2017-01-01 15:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(3) "UTC" } object(DateTime)#1 (3) { ["date"]=> string(26) "2017-01-01 15:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(3) "UTC" } object(DateTime)#1 (3) { ["date"]=> string(26) "2017-01-01 21:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(3) "UTC" } object(DateTime)#1 (3) { ["date"]=> string(26) "2017-01-01 21:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(3) "UTC" } object(DateTime)#1 (3) { ["date"]=> string(26) "2017-01-02 04:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(3) "UTC" } object(DateTime)#1 (3) { ["date"]=> string(26) "2017-01-02 04:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(3) "UTC" } object(DateTime)#1 (3) { ["date"]=> string(26) "2017-01-02 12:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(3) "UTC" } object(DateTime)#1 (3) { ["date"]=> string(26) "2017-01-02 12:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(3) "UTC" } object(DateTime)#1 (3) { ["date"]=> string(26) "2017-01-02 21:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(3) "UTC" } object(DateTime)#1 (3) { ["date"]=> string(26) "2017-01-02 21:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(3) "UTC" } object(DateTime)#1 (3) { ["date"]=> string(26) "2017-01-03 07:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(3) "UTC" } object(DateTime)#1 (3) { ["date"]=> string(26) "2017-01-03 07:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(3) "UTC" }