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@ 2015-03-31T07:42:02Z

<?php
$endDate = strtotime('2015-03-30 11:59:59');

$endDate = $endDate % 1800;

$endDate = date('Y-m-d H:i:s', $endDate);

$startDate = date('Y-m-d H:i:s', strtotime($endDate . " - 1800 seconds"));

echo $startDate;

Output
Performance
VLD
References
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date: documentation ( source)
strtotime: documentation ( source)

preferences:dark modelive preview

70.95 ms | 402 KiB | 5 Q