Function Nama Hari indonesia PHP

	function hari_indo($tgl){
	        $day = date('D', $tgl);
        switch ($day) {
        case 'Sun' : $hari = "Minggu"; break;
        case 'Mon' : $hari = "Senin"; break;
        case 'Tue' : $hari = "Selasa"; break;
        case 'Wed' : $hari = "Rabu"; break;
        case 'Thu' : $hari = "Kamis"; break;
        case 'Fri' : $hari = "Jum'at"; break;
        case 'Sat' : $hari = "Sabtu"; break;
        default : $hari = "Hari Eror";
        }
			return $hari ;
	}

aku bikin kode kayak di atas,,, trus ku masukin 2021-10-25,,, tapi kok munculnya kamis ? ? aku udah coba format lain 2021-25-10, tetep ga berfungsi,,,,

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