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<?php echo strtotime('13:00:00');
Output for 5.6.28, 7.0.20 - 7.2.0
1444215600
Output for 7.0.6
1462186800
Output for 7.0.5
1459594800
Output for 7.0.4
1457524800
Output for 7.0.3
1458216000
Output for 7.0.2
1458561600
Output for 7.0.1
1458734400
Output for 7.0.0
1458993600
Output for 5.6.21
1462100400
Output for 5.6.20
1460199600
Output for 5.6.19
1457265600
Output for 5.6.18
1457956800
Output for 5.6.17
1458388800
Output for 5.6.16
1459076400
Output for 5.6.15
1459162800
Output for 5.6.14
1459508400
Output for 5.6.13
1460631600
Output for 5.6.12
1461063600
Output for 5.6.11
1461322800
Output for 5.6.10
1461495600
Output for 5.6.9
1461754800
Output for 5.6.8
1461927600
Output for 5.6.7
1464087600
Output for 5.5.35
1463828400
Output for 5.5.34
1460286000
Output for 5.5.33
1457438400
Output for 5.5.32
1458043200
Output for 5.5.31
1458475200
Output for 5.5.30
1459422000
Output for 5.5.29
1460804400
Output for 5.5.28
1461150000
Output for 5.5.27
1461236400
Output for 5.5.26
1461582000
Output for 5.5.25
1461841200
Output for 5.5.24
1462014000
Output for 5.3.18 - 5.4.45
1447070400