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<?php echo strtotime('6 month ago');
Output for 5.6.28, 7.0.20 - 7.2.0
1428482160
Output for 7.0.6
1446549239
Output for 7.0.5
1443826664
Output for 7.0.4
1441878048
Output for 7.0.3
1442571864
Output for 7.0.2
1442938925
Output for 7.0.1
1443041116
Output for 7.0.0
1443305687
Output for 5.6.21
1446445632
Output for 5.6.20
1444427327
Output for 5.6.19
1441647773
Output for 5.6.18
1442283401
Output for 5.6.17
1442673188
Output for 5.6.16
1443399150
Output for 5.6.15
1443488888
Output for 5.6.14
1443755966
Output for 5.6.13
1444893513
Output for 5.6.12
1445289355
Output for 5.6.11
1445573529
Output for 5.6.10
1445756320
Output for 5.6.9
1445947349
Output for 5.6.8
1446149582
Output for 5.5.35
1448187230
Output for 5.5.34
1444522208
Output for 5.5.33
1441744849
Output for 5.5.32
1442463698
Output for 5.5.31
1442769387
Output for 5.5.30
1443668568
Output for 5.5.29
1445030795
Output for 5.5.28
1445387757
Output for 5.5.27
1445482374
Output for 5.5.26
1445851857
Output for 5.5.25
1446047844
Output for 5.5.24
1448319900
Output for 5.4.40 - 5.4.45
1428482166
Output for 5.4.28 - 5.4.39
1428482167
Output for 5.4.15 - 5.4.27
1428482168
Output for 5.4.8 - 5.4.14
1428482169
Output for 5.4.7
1430092886
Output for 5.4.6
1430098191
Output for 5.4.5
1430103606
Output for 5.4.4
1430109442
Output for 5.4.3
1430115534
Output for 5.4.2
1430121818
Output for 5.3.29
1430452922
Output for 5.3.28
1430460649
Output for 5.3.27
1430543532
Output for 5.3.26
1430550806
Output for 5.3.25
1430556191
Output for 5.3.24
1430560483
Output for 5.3.23
1430566280
Output for 5.3.22
1430571729
Output for 5.3.21
1430575339
Output for 5.3.20
1430578961
Output for 5.3.19
1430584076
Output for 5.3.18
1430584473