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run code in 200+ php & hhvm versions
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<?php echo strtotime('now') - strtotime("2016-01-17 13:36:18"); echo strtotime('now'); ?>
based on CX5e2
Output for 5.6.28, 7.0.20 - 7.2.0
37311453037909
Output for 7.0.6
107975651463831743
Output for 7.0.5
66357521459669930
Output for 7.0.4
46094041457643582
Output for 7.0.3
53059001458340078
Output for 7.0.2
56739351458708113
Output for 7.0.1
57712941458805472
Output for 7.0.0
60336701459067848
Output for 5.6.21
91662271462200405
Output for 5.6.20
72370971460271275
Output for 5.6.19
43796081457413786
Output for 5.6.18
50167211458050899
Output for 5.6.17
54038401458438018
Output for 5.6.16
61230601459157238
Output for 5.6.15
62124361459246614
Output for 5.6.14
76153781460649556
Output for 5.6.13
77041131460738291
Output for 5.6.12
81019491461136127
Output for 5.6.11
84706951461504873
Output for 5.6.10
85646471461598825
Output for 5.6.9
87571211461791299
Output for 5.6.8
89603131461994491
Output for 5.5.35
109305011463964679
Output for 5.5.34
73315901460365768
Output for 5.5.33
44771101457511288
Output for 5.5.32
52038391458238017
Output for 5.5.31
55018081458535986
Output for 5.5.30
64783161459512494
Output for 5.5.29
78419901460876168
Output for 5.5.28
82003191461234497
Output for 5.5.27
82925671461326745
Output for 5.5.26
86607371461694915
Output for 5.5.25
88603291461894507
Output for 5.5.24
110438091464077987
Output for 5.4.44 - 5.4.45
37331453037911
Output for 5.4.42 - 5.4.43
37341453037912
Output for 5.4.40 - 5.4.41
37351453037913
Output for 5.4.39
37361453037914
Output for 5.4.36 - 5.4.38
37371453037915
Output for 5.4.34 - 5.4.35
37381453037916
Output for 5.3.29, 5.4.31 - 5.4.32
37391453037917
Output for 5.4.28 - 5.4.30
37401453037918
Output for 5.4.25 - 5.4.27
37411453037919
Output for 5.3.28, 5.4.23 - 5.4.24
37421453037920
Output for 5.4.19 - 5.4.22
37431453037921
Output for 5.3.26 - 5.3.27, 5.4.16 - 5.4.18
37441453037922
Output for 5.3.23 - 5.3.25, 5.4.12 - 5.4.15
37451453037923
Output for 5.3.22
37461453037924