Hello new to Yii, the GridView has a column with the end date of the subscription and also a column with the start date of the subscription. I made a column with the beginning of the subscription so that each value can be selected in the calendar format. Now I need to be able to choose how long this subscription will last (month, two, six months) in the column with the end of the subscription. In this case, the value itself would be calculated relative to the beginning, and the interval that I choose. Tell me how best to implement
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