2.1.664 Part 1 Section 18.3.2.4, dateGroupItem (Date Grouping)
a. The standard does not specify a default value for the month attribute.
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Excel uses a default value of 1 for this attribute.
b. The standard does not specify a default value for the day attribute.
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Excel uses a default value of 1 for this attribute.
c. The standard does not specify a default value for the hour attribute.
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Excel uses a default value of 0 for this attribute.
d. The standard does not specify a default value for the minute attribute.
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Excel uses a default value of 0 for this attribute.
e. The standard does not specify a default value for the second attribute.
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Excel uses a default value of 0 for this attribute.