About [[Europeana:Date.formats.long/en]]
Appearance
What do the letters d, B and Y stand for?
See http://ruby-doc.org/core-2.0/Time.html#method-i-strftime
%d - Day of the month, zero-padded (01..31) %B - The full month name (January) %Y - Year with century (can be negative, 4 digits at least)