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Feb
29
comment How to sum ​​values ​​in a range of dates
if you want to have alphabetical order coincidating with chronological, use the following format: 2012-02-29 ie yyyy-mm-dd
Feb
28
comment How to sum ​​values ​​in a range of dates
just for clarification: yes it works because it use then alphabetical order on string, but you may have issues with different years...