translate English to French: first day of the period , and shall end with the expiry of the last hour of whichever day in the last week , month or year is the same day of the week , or falls on the same date , as the day from which the period runs . if , in a period expressed in months or in years , the day on which it should expire does not occur in the last month , the period shall end with the expiry of the last hour of the last day of that month ; (d) if a period includes parts of months , the month shall , for the purpose of calculating such parts , be considered as having thirty days . 3.
Cette disposition n'est pas applicable aux délais calcules rétroactivement à partir d'une date ou d'un événement déterminé.