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The interval is defined by start date <= item date < next start date. rmonthdayzDate out of rangeN)replacer ValueErrorrr)rr!rrr_get_next_year?s' zYearMixin._get_next_yearcCs|jddddS)z@ Return the start date of the current interval. r%r$r&)r')rr!rrr_get_current_yearJszYearMixin._get_current_year) __name__ __module__ __qualname____doc__rrrrr"r#r)r*rrrrrs      rc@sjeZdZdZdZdZddZddZdd Zd d Z d d Z ddZ dS) MonthMixinz8 Mixin for views manipulating month-based data. z%bNcCs|jS)zx Get a month format string in strptime syntax to be used to parse the month from url variables. ) month_format)rrrrget_month_formatXszMonthMixin.get_month_formatcCs}|j}|dkryy|jd}Wqytk ruy|jjd}Wn$tk rpttdYnXYqyXn|S)zK Return the month for which this view should display data. 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