Dates ruby core, date, memos

i.e. : @comment.created_at.strftime("%d %b %y")

%a - The abbreviated weekday name (''Sun'')
%A - The  full  weekday  name (''Sunday'')
%b - The abbreviated month name (''Jan'')
%B - The  full  month  name (''January'')
%c - The preferred local date and time representation
%d - Day of the month (01..31)
%H - Hour of the day, 24-hour clock (00..23)
%I - Hour of the day, 12-hour clock (01..12)
%j - Day of the year (001..366)
%m - Month of the year (01..12)
%M - Minute of the hour (00..59)
%p - Meridian indicator (''AM'' or ''PM'')
%S - Second of the minute (00..60)
%U - Week  number  of the current year,
      starting with the first Sunday as the first
      day of the first week (00..53)
%W - Week  number  of the current year,
      starting with the first Monday as the first
      day of the first week (00..53)
%w - Day of the week (Sunday is 0, 0..6)
%x - Preferred representation for the date alone, no time
%X - Preferred representation for the time alone, no date
%y - Year without a century (00..99)
%Y - Year with century
%Z - Time zone name
%% - Literal ''%'' character