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<?php $interval1_start = 60 * 60 * 8; // 8am $interval1_end = 60 * 60 * 12 -1; // 11:59:59am $interval2_start = 60 * 60 * 12; // 12pm $interval2_end = 60 * 60 * 16 -1; // 15:59:59pm $interval3_start = 60 * 60 * 15; // 15pm $interval3_end = 60 * 60 * 20 -1; // 15:59:59pm $init_time = strtotime(date('Y-m-d')); $cur_time = time(); $diff = $cur_time - $init_time; if ($diff >= $interval1_start && $diff <= $interval1_end) { echo 'code 1'; } elseif ($diff >= $interval2_start && $diff <= $interval2_end) { echo 'code 2'; } elseif ($diff >= $interval3_start && $diff <= $interval3_end) { echo 'code 3'; }