Here is a site that can explain dynamic named ranges better than I can.
http://www.contextures.com/xlNames01.html#Dynamic
I created 3 charts for you in the attached workbook.
1. Basic Dynamic expands as you add dates in row 6.
2. Latest History, takes the final x dates of data only
3. Range, input a beginning and ending date to chart a range.
Is that what you are looking for?
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