3v4l.org

run code in 200+ php & hhvm versions
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<?php print strtotime("-13 months");
Output for 5.6.28, 7.0.20 - 7.2.0
1407474533
Output for 7.0.6
1428041879
Output for 7.0.5
1425327272
Output for 7.0.4
1423549955
Output for 7.0.3
1424243143
Output for 7.0.2
1424609461
Output for 7.0.1
1424713917
Output for 7.0.0
1424979050
Output for 5.6.21
1427938672
Output for 5.6.20
1425928025
Output for 5.6.19
1423319981
Output for 5.6.18
1423952739
Output for 5.6.17
1424345046
Output for 5.6.16
1425071807
Output for 5.6.15
1425161376
Output for 5.6.14
1425257024
Output for 5.6.13
1426394351
Output for 5.6.12
1426789025
Output for 5.6.11
1427073462
Output for 5.6.10
1427252826
Output for 5.6.9
1427443478
Output for 5.6.8
1427641534
Output for 5.6.7
1429954976
Output for 5.5.35
1429679967
Output for 5.5.34
1426023071
Output for 5.5.33
1423416533
Output for 5.5.32
1424132216
Output for 5.5.31
1424441449
Output for 5.5.30
1425169079
Output for 5.5.29
1426531457
Output for 5.5.28
1426886566
Output for 5.5.27
1426982022
Output for 5.5.26
1427347977
Output for 5.5.25
1427542581
Output for 5.5.24
1429810331
Output for 5.4.42 - 5.4.45
1407474542
Output for 5.4.36 - 5.4.41
1407474543
Output for 5.4.28 - 5.4.35
1407474544
Output for 5.4.21 - 5.4.27
1407474545
Output for 5.4.14 - 5.4.20
1407474546
Output for 5.4.7 - 5.4.13
1407474547
Output for 5.4.6
1411780576
Output for 5.4.5
1411786025
Output for 5.4.4
1411791729
Output for 5.4.3
1411797812
Output for 5.4.2
1411804139
Output for 5.3.28 - 5.3.29
1408546525
Output for 5.3.26 - 5.3.27
1408546524
Output for 5.3.24 - 5.3.25
1408546523
Output for 5.3.22 - 5.3.23
1408546522
Output for 5.3.20 - 5.3.21
1408546521
Output for 5.3.18 - 5.3.19
1408546520
Output for 5.3.17
1408546519