// First day of the week (0 = Sunday)
$firstDay = DI::pConfig()->get(DI::userSession()->getLocalUserId(), 'calendar', 'first_day_of_week', 0);
// First day of the week (0 = Sunday)
$firstDay = DI::pConfig()->get(DI::userSession()->getLocalUserId(), 'calendar', 'first_day_of_week', 0);