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<?php print_r( strtotime('2013-07-20 00:13:51.153000000') ); echo '--------------------------------'; print_r( strtotime('2013-07-20 00:13:51') );
Output for 5.0.0 - 5.0.5, 8.0.10 - 8.0.12, 8.0.14 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
1374272031--------------------------------1374272031
Output for 8.0.13
1374279231--------------------------------1374279231
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.25, 7.4.27 - 7.4.33, 8.0.0 - 8.0.9
--------------------------------1374272031
Output for 7.3.32 - 7.3.33, 7.4.26
--------------------------------1374279231
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9
-1--------------------------------1374272031

preferences:
210.15 ms | 401 KiB | 359 Q