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<?php
//devo mappare la data scritta come stringa con il formato usato
$dtime = DateTime::createFromFormat("d/m/Y", get_field('data'));

//ne estraggo il timestamp
$unixtimestamp = $dtime->getTimestamp();

// DETAILS HERE - https://php.net/strftime

//formatto come mi pare i vari componenti
$dateformatstring = "<span class=\"gStr\">%a</span><span class=\"gN\">%d</span><span class=\"mStr\">%b</span>";

//lo stampo preservando gli accenti
echo utf8_encode(strftime($dateformatstring, $unixtimestamp));