How to group date-and-time data
1  
Select the column that contains the date-and-time data. From the context menu, choose GroupAdd Group.
2  
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Type a number to indicate the grouping for the selected interval type. For example, if you selected Weeks, type 2 to group data in two-week periods.
Figure 5-11 shows grouping the Shipped Date column by month.
Figure 5-11  

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