When viewing a report you can either filter by date or by a pre-defined set of date ranges.  

To better understand what the date ranges cover see below: 

Today: This pulls and displays data from the current day 

This week:  This displays data from Sunday to Saturday of the current week. e.g-   if the date was April 1, 2014, the date range would include data from March 30 to April 5, 2014. 

Last week:  This displays data from Sunday to Saturday of the past week. e.g-  if the date was April 1, 2014, the date range would include data from March 23 to March 29, 2014.

Last month: This displays data from from the past month. e.g- if the date was April 2, 2014, the date range would include data from March 1 - 31, 2014. 

Last quarter: This displays data from the past quarter. e.g- if the date was April 1, 2014, the date range would include data from Jan 1 - March 31, 2014 .  

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