public static function dayOfWeekName($date = NULL,
$abbr = TRUE
) { $date =
$date ?? 'now';
if (!
$date instanceof DrupalDateTime
) { $date =
new DrupalDateTime($date);
} if (!
$date->
hasErrors()) { $dow = self::
dayOfWeek($date);
$days =
$abbr ? self::
weekDaysAbbr() : self::
weekDays();
return $days[$dow]->
getUntranslatedString();
} return NULL;
}}