3v4l.org

run code in 150+ php & hhvm versions
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<?php print_r(strtotime("first day 00:00:00"));
Output for 5.6.28, 7.0.14 - 7.1.0
1372284000
Output for 7.0.6
1462312800
Output for 7.0.5
1459720800
Output for 7.0.4
1457650800
Output for 7.0.3
1458342000
Output for 7.0.2
1458774000
Output for 7.0.1
1458860400
Output for 7.0.0
1459116000
Output for hhvm-3.12.0
1457910000
Output for hhvm-3.10.0
1459461600
Output for 5.6.21
1462226400
Output for 5.6.20
1460325600
Output for 5.6.19
1457478000
Output for 5.6.18
1458082800
Output for 5.6.17
1458428400
Output for 5.6.16
1459202400
Output for 5.6.15
1459288800
Output for 5.6.14
1459634400
Output for 5.6.13
1460757600
Output for 5.6.12
1461189600
Output for 5.6.11
1461535200
Output for 5.6.10
1461621600
Output for 5.6.9
1461794400
Output for 5.6.8
1462053600
Output for 5.5.35
1463954400
Output for 5.5.34
1460412000
Output for 5.5.33
1457564400
Output for 5.5.32
1458255600
Output for 5.5.31
1458601200
Output for 5.5.30
1459548000
Output for 5.5.29
1460930400
Output for 5.5.28
1461276000
Output for 5.5.27
1461362400
Output for 5.5.26
1461708000
Output for 5.5.25
1461880800
Output for 5.5.24
1464127200
Output for 4.3.0 - 5.2.17, 5.3.3 - 5.4.45
1446764400
Output for 5.3.0 - 5.3.2
1446332400