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<?php var_dump(new DateTime("first day of this month"));
based on iYQR6
Output for 7.2.0
object(DateTime)#1 (3) { ["date"]=> string(26) "2015-11-01 12:39:43.004940" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 7.1.10
object(DateTime)#1 (3) { ["date"]=> string(26) "2015-11-01 12:39:43.005513" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 7.1.7
object(DateTime)#1 (3) { ["date"]=> string(26) "2015-11-01 12:39:43.002916" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 7.1.6
object(DateTime)#1 (3) { ["date"]=> string(26) "2015-11-01 12:39:43.012800" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 7.1.5
object(DateTime)#1 (3) { ["date"]=> string(26) "2015-11-01 12:39:43.008186" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 7.1.0
object(DateTime)#1 (3) { ["date"]=> string(26) "2015-11-01 12:39:43.004146" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.6.28, 7.0.20
object(DateTime)#1 (3) { ["date"]=> string(26) "2015-11-01 12:39:43.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 7.0.6
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-05-01 19:06:13.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 7.0.5
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-04-01 07:29:27.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 7.0.4
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-03-01 19:19:36.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 7.0.3
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-03-01 20:33:54.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 7.0.2
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-03-01 02:41:55.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 7.0.1
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-03-01 06:13:13.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 7.0.0
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-03-01 08:08:50.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.6.21
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-05-01 14:15:06.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.6.20
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-04-01 06:29:09.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.6.19
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-03-01 03:31:15.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.6.18
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-03-01 12:18:45.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.6.17
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-03-01 23:54:22.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.6.16
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-03-01 08:56:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.6.15
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-03-01 09:46:57.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.6.14
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-04-01 11:35:47.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.6.13
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-04-01 16:05:16.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.6.12
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-04-01 06:33:23.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.6.11
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-04-01 12:56:46.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.6.10
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-04-01 14:59:03.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.6.9
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-04-01 20:09:01.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.6.8
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-04-01 05:01:10.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.5.35
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-05-01 22:21:13.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.5.34
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-04-01 08:40:44.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.5.33
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-03-01 06:18:47.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.5.32
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-03-01 16:10:46.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.5.31
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-03-01 02:58:15.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.5.30
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-04-01 11:40:10.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.5.29
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-04-01 06:26:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.5.28
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-04-01 09:48:03.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.5.27
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-04-01 11:32:46.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.5.26
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-04-01 17:41:55.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.5.25
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-04-01 00:59:11.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.5.24
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-05-01 07:18:11.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.4.45
object(DateTime)#1 (3) { ["date"]=> string(26) "2015-11-01 12:39:45.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.4.44
object(DateTime)#1 (3) { ["date"]=> string(26) "2015-11-01 12:39:46.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.4.43
object(DateTime)#1 (3) { ["date"]=> string(26) "2015-11-01 12:39:47.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.4.41 - 5.4.42
object(DateTime)#1 (3) { ["date"]=> string(26) "2015-11-01 12:39:48.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.4.40
object(DateTime)#1 (3) { ["date"]=> string(26) "2015-11-01 12:39:49.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.4.38 - 5.4.39
object(DateTime)#1 (3) { ["date"]=> string(26) "2015-11-01 12:39:50.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.4.35 - 5.4.37
object(DateTime)#1 (3) { ["date"]=> string(26) "2015-11-01 12:39:51.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.4.31 - 5.4.34
object(DateTime)#1 (3) { ["date"]=> string(26) "2015-11-01 12:39:52.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.4.30
object(DateTime)#1 (3) { ["date"]=> string(26) "2015-11-01 12:39:53.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.4.27 - 5.4.29
object(DateTime)#1 (3) { ["date"]=> string(19) "2015-11-01 12:39:53" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.4.24 - 5.4.26
object(DateTime)#1 (3) { ["date"]=> string(19) "2015-11-01 12:39:54" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.3.28, 5.4.22 - 5.4.23
object(DateTime)#1 (3) { ["date"]=> string(19) "2015-11-01 12:39:55" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.4.20 - 5.4.21
object(DateTime)#1 (3) { ["date"]=> string(19) "2015-11-01 12:39:56" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.3.27, 5.4.17 - 5.4.19
object(DateTime)#1 (3) { ["date"]=> string(19) "2015-11-01 12:39:57" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.3.25 - 5.3.26, 5.4.15 - 5.4.16
object(DateTime)#1 (3) { ["date"]=> string(19) "2015-11-01 12:39:58" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.3.21 - 5.3.24, 5.4.12 - 5.4.14
object(DateTime)#1 (3) { ["date"]=> string(19) "2015-11-01 12:39:59" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.3.19 - 5.3.20, 5.4.9 - 5.4.11
object(DateTime)#1 (3) { ["date"]=> string(19) "2015-11-01 12:40:00" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.3.29
object(DateTime)#1 (3) { ["date"]=> string(19) "2015-11-01 12:39:52" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }