The filename can only be sorted numerically/alphabetically. Filenames do not have fields, they are simply 256 characters.
You cannot sort them by date because anthing beginning with a 1 with be first i.e. 1.1.2007 followed by 1.4.2009 etc
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Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.