<?php
$eff = date_create_from_format('m/Y', $eff);
switch(true)
{
case (date_create_from_format('m/Y', '10/2017')->diff($eff)->format('%R%m') >= 0):
echo "Greater than 10-2017";
break;
case (date_create_from_format('m/Y', '09/2017')->diff($eff)->format('%R%m') <= 0):
echo "Less thank 10-2017";
break;
default:
echo '';
break;
}
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