Where to store functions used in view in Yii?

Question

Yii

Good evening!
There is a function that processes dates from the database to display the form:
"September 10-15" or October 30 - November 2"

public function getSeminarDate($date_begin, $date_end) {
        if(Yii::$app->formatter->asDate('$date_begin', 'M') == Yii::$app->formatter->asDate('$date_end', 'M')) {  
            return Yii::$app->formatter->asDate('$date_begin', 'dd').'-'.Yii::$app->formatter->asDate('$date_end', 'dd');
        }
        else {
            return Yii::$app->formatter->asDate('$date_begin', 'dd').' '.
            Yii::$app->formatter->asDate('$date_begin', 'MMMM').'-'.
            Yii::$app->formatter->asDate('$date_end', 'dd').' '.
            Yii::$app->formatter->asDate('$date_end', 'MMMM');
        }
    }

This function takes 2 fields from the database and outputs them to a string, of the form indicated above. Where is it better to store this function and how to call it in the view?
Thank you!

Answer 1

1) we use twig
2) we write or use ready-made filters and / or functions. Then instead of this nonsense in controllers you will have:

<div class="workshop-date">{{ workshopDate(workshop)  }}</div>