library/Extlib/Utils.php
public function niceDate(\DateTime $date)
    {
        $now = $this->system->getDate();

        if ($now->format('Y-m-d') === $date->format('Y-m-d')) {
            return $date->format('H:i');
        } elseif ($now->format('Y-m') === $date->format('Y-m') && $date->format('d') + 1 == $now->format('d')) {
            return sprintf($this->translate('yesterday, %s'), $date->format('H:i'));
        }

        return $date->format('d-m-Y');
    }
public function niceDate(\DateTime $date)
    {
        $now = $this->system->getDate();

        if ($now->format('Y-m-d') === $date->format('Y-m-d')) {
            return $date->format('H:i');
        } elseif ($now->format('Y-m') === $date->format('Y-m') && $date->format('d') + 1 == $now->format('d')) {
            return sprintf($this->translate('yesterday, %s'), $date->format('H:i'));
        }

        return $date->format('d-m-Y');
    }
Create "nice" date

@param \DateTime $date
@return string