var_dump(DateTime::createFromFormat('m.Y', '09.2021'))

object(DateTime)#4 (3) { ["date"]=> string(26) "2021-10-01 23:17:05.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(13) "Europe/Moscow" }

object(DateTime)#3 (3) { ["date"]=> string(26) "2021-09-01 10:04:45.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(13) "Europe/Moscow" }