src/pycalendar/datetime.py [444:455]:
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        self.mDay = 1

        # Determine first weekday in year
        first_day = self.getDayOfWeek()

        if offset > 0:
            cycle = (offset - 1) * 7 + day
            cycle -= first_day
            if first_day > day:
                cycle += 7
            self.mDay = cycle + 1
        elif offset < 0:
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src/pycalendar/datetime.py [469:480]:
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        self.mDay = 1

        # Determine first weekday in month
        first_day = self.getDayOfWeek()

        if offset > 0:
            cycle = (offset - 1) * 7 + day
            cycle -= first_day
            if first_day > day:
                cycle += 7
            self.mDay = cycle + 1
        elif offset < 0:
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