A calendar month as defined in section 33(6)(c) of the Interpretation Act runs from the beginning of a month to the end of that month as it stands in the calendar, not from mid-month to mid-month. An application filed before the expiry of such a period is premature and must be dismissed. For rescission applications under Rule 63(1), the one-month period runs from the date the party had knowledge of the judgment, not from the date of judgment. In considering rescission of default judgments, courts must balance: the degree of non-compliance with rules, the explanation for default, prospects of success on the merits, the importance of the case, convenience of the court, and avoidance of unnecessary delay. Where there is a bona fide explanation for default (such as non-service of a chamber application) and prospects of success on the merits, particularly in matters involving immovable property, rescission should be granted as courts are reluctant to decide against a party without hearing them when they protest having a valid defense.