I frequently use a specific date format that's not able to be achieved using the dynamic placeholders for snippets (without changing my system date formatting) :
https://www.alfredapp.com/help/features/clipboard/dynamic-placeholders/
Specifically, I prefer to have yymmdd as a snippet (it's a compliant file name without punctuation and sorts naturally).
When making sure I wasn't filing a duplicate, I came across a different but related request, just for the year:
http://www.alfredforum.com/topic/1021-snippet-year-placeholder/?hl=%2Bdate+%2Bsnippet
So my request is that of enabling more granular date formatting... perhaps breaking it into components such that I might be able to use:
{year:small}{month:small}{day:small}
Actual tag names aren't as important as the functionality, so something already known and documented would be more flexible, such as Python's strftime's spec:
https://docs.python.org/2/library/datetime.html#strftime-and-strptime-behavior
ie:
{date:'%y%m%d'}
That would make me so happy.