Calendar week within month (see ISO 8601-1). First Calendar week contains the first of the month, with the calendar week starting on a Monday. Several days of the first week of the month may occur in the previous calendar month. By construction, the last week of a preceding month can also be the first week of a subsequent month.<br/>
WeekofMonth is calculated as follows. The calendar week commences on a Monday (as per ISO 8601-1). The first week of a month is the calendar week containing the first of the month. Several days of the first week of the month may occur in the previous calendar month. The last week of the month contains the last day of the month in question.<br/>
