3v4l.org

run code in 200+ php & hhvm versions
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<?php print strtotime('14-12-2015'); print ' '; echo strtotime('today');
based on iXWfM
Output for 5.3.20 - 5.4.45, 5.6.28, 7.0.20 - 7.2.0
1450047600 1450134000
Output for 7.0.6
1450047600 1463781600
Output for 7.0.5
1450047600 1459634400
Output for 7.0.4
1450047600 1457564400
Output for 7.0.3
1450047600 1458255600
Output for 7.0.2
1450047600 1458687600
Output for 7.0.1
1450047600 1458774000
Output for 7.0.0
1450047600 1459033200
Output for 5.6.21
1450047600 1462140000
Output for 5.6.20
1450047600 1460239200
Output for 5.6.19
1450047600 1457391600
Output for 5.6.18
1450047600 1457996400
Output for 5.6.17
1450047600 1458428400
Output for 5.6.16
1450047600 1459116000
Output for 5.6.15
1450047600 1459202400
Output for 5.6.14
1450047600 1460584800
Output for 5.6.13
1450047600 1460671200
Output for 5.6.12
1450047600 1461103200
Output for 5.6.11
1450047600 1461448800
Output for 5.6.10
1450047600 1461535200
Output for 5.6.9
1450047600 1461708000
Output for 5.6.8
1450047600 1461967200
Output for 5.5.35
1450047600 1463954400
Output for 5.5.34
1450047600 1460325600
Output for 5.5.33
1450047600 1457478000
Output for 5.5.32
1450047600 1458169200
Output for 5.5.31
1450047600 1458514800
Output for 5.5.30
1450047600 1459461600
Output for 5.5.29
1450047600 1460844000
Output for 5.5.28
1450047600 1461189600
Output for 5.5.27
1450047600 1461276000
Output for 5.5.26
1450047600 1461621600
Output for 5.5.25
1450047600 1461880800
Output for 5.5.24
1450047600 1464040800