//現在日時 $s1Date = new DateTime(); echo $s1Date->format('Y-m-d H:i:s');
//任意の日時 $s2Date = new DateTime('2017/07/01 12:01:05'); echo $s2Date->format('Y/m/d H:i:s');
$s3Date = new DateTime(); $s3Week = array("日", "月", "火", "水", "木", "金", "土"); $w = (int)$s3Date->format('w'); echo $s3Week[$w];