[Mutt] #3406: folder_format %d should reference date_format

[Mutt <fleas@xxxxxxxx>]

#3406: folder_format %d should reference date_format
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 Reporter:  rubix                      |       Owner:  mutt-dev
     Type:  enhancement                |      Status:  new     
 Priority:  trivial                    |   Milestone:          
Component:  mutt                       |     Version:  1.5.18  
 Keywords:  folder_format date_format  |  
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 It would simplify date formatting across variables, assuming people want
 that.

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Ticket URL: <http://dev.mutt.org/trac/ticket/3406>
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