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@ 2015-12-23T21:57:32Z

<?php

$minutes = 5;

echo (floor(6/$minutes) * $minutes) . "\n";

echo (new DateTime('2001-01-01 01:' . (floor(1/$minutes) * $minutes) . ':60'))->format('Y-m-d H:i:s') . "\n";
echo (new DateTime('2001-01-01 01:' . (ceil(1/$minutes) * $minutes) . ':60'))->format('Y-m-d H:i:s') . "\n";

Output
Performance
VLD
References
Branches

floor: documentation ( source)
ceil: documentation ( source)

preferences:dark modelive preview

45.54 ms | 402 KiB | 5 Q