<?php $time_range_specified = false; if (!isset($from_time) || (isset($from_time) && $from_time == '')) { $from_time = '0000-01-01'; } else { $time_range_specified = true; } if (!isset($until_time) || (isset($until_time) && $until_time == '')) { $until_time = '9999-12-31'; } else { $time_range_specified = true; } ?>