2.1.668 Part 1 Section 18.3.2.8, filters (Filter Criteria)
a. The standard states that the filter and dateGroupItem child elements should be sequenced.
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Excel requires these child elements to be a choice of one or the other.
b. The standard defines the calendarType attribute for date grouped items.
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Office ignores the calendarType attribute.
c. The standard states that the calendarType attribute is of type ST_CalendarType, which has a value for "saka".
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Office does not support the ST_CalendarType value of "saka" and instead treats the "saka" value as equivalent to the "none" value of ST_CalendarType.