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<?php $date1=date_create("15-04-2018 22:00", new DateTimeZone('Asia/Ulan_Bator')); $date2=date_create("now", new DateTimeZone('America/Buenos_Aires')); $diff=date_diff($date1,$date2); print_r($diff->days == 457); ?>
Output for 5.6.0 - 5.6.29, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
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