Ruby und Datum Format Optionen

%a - Abgekürzter Wochentag
%A - Voller Wochentag
%b - Abgekürzter Montasname
%B - Voller Monatsname
%c - Bevorzugte Datums und Uhrzeitausgabe
%C - Jahrhundert
%d - Tag des Monats (01 bis 31)
%D - Das gleiche wie %m/%d/%y
%e - Tag des Monats als Zahl, wobei einstelligen Werten ein Leerzeichen vorangstellt wird (' 1' to '31')
%g - Wie %G, aber ohne das Jahrhundert.
%G - The 4-digit year corresponding to the ISO week number (see %V).
This has the same format and value as %Y, except that if the ISO week
number to the previous or next year, that year is used instead.
%h - same as %b
%H - hour as a decimal number using a 24-hour clock (range 00 to 23)
%I - hour as a decimal number using a 12-hour clock (range 01 to 12)
%j - day of the year as a decimal number (range 001 to 366)
%m - month as a decimal number (range 01 to 12)
%M - minute as a decimal number
%n - newline character
%p - either `am' or `pm' according to the given time value, or the
corresponding strings for the current locale
%r - time in a.m. and p.m. notation
%R - time in 24 hour notation
%S - second as a decimal number
%t - tab character
%T - current time, equal to %H:%M:%S
%u - weekday as a decimal number [1,7], with 1 representing Monday
%U - week number of the current year as a decimal number, starting with
the first Sunday as the first day of the first week
%V - The ISO 8601:1988 week number of the current year as a decimal
number, range 01 to 53, where week 1 is the first week that has at
least 4 days in the current year, and with Monday as the first day
of the week. (Use %G or %g for the year component that corresponds
to the week number for the specified timestamp.)
%W - week number of the current year as a decimal number, starting with
the first Monday as the first day of the first week
%w - day of the week as a decimal, Sunday being 0
%x - preferred date representation for the current locale
without the time
%X - preferred time representation for the current locale
without the date
%y - year as a decimal number without a century (range 00 to 99)
%Y - year as a decimal number including the century
%Z or %z - time zone or name or abbreviation
%% - a literal `%' character