Dump date/time formats with examples of a locale in Rails

[outputs]

$ bin/rake i18n:show_sample_dates_and_times['en-MY']
time:
  date                          : %m/%d/%Y                      : 2012-10-15
  date_day                      : %d                            : 15
  date_hour                     : %l:%M %p                      :  4:13 pm
  date_month                    : %B                            : October
  date_month_name               : %B %e, %Y                     : 15 October 2012
  date_month_year               : %B %Y                         : October 2012
  date_short_month_year         : %e %b %Y                      : 15 Oct 2012
  date_short_year               : %m/%d/%y                      : 15-10-12
  date_with_hour                : %B %e, %Y @ %l:%M%p           : 15 October 2012 @  4:13pm
  date_with_zone                : %B %e %l:%M%p %Z              : 15 October  4:13pm CDT
  day_month                     : %e %B                         : 15 October
  day_short_month               : %e %b                         : 15 Oct
  default                       : %a, %d %b %Y %H:%M:%S %z      : Mon, 15 Oct 2012 16:13:27 -0500
  long                          : %B %d, %Y %H:%M               : 15 October 2012 16:13
  short                         : %d %b %H:%M                   : 15 Oct 16:13
  title_endian                  : %d %b %Y                      : 15 Oct 2012
  twelve_hour_time              : %I %p                         : 04 pm
  year                          : %Y                            : 2012
date:
  date                          : %m/%d/%Y                      : 2012-10-15
  date_day                      : %d                            : 15
  date_hour                     : %l:%M %p                      : 12:00 
  date_month                    : %B                            : October
  date_month_name               : %B %e, %Y                     : 15 October 2012
  date_month_year               : %B %Y                         : October 2012
  date_short_month_year         : %e %b %Y                      : 15 Oct 2012
  date_short_year               : %m/%d/%y                      : 12-10-15
  date_with_hour                : %B %e, %Y @ %l:%M%p           : 15 October 2012 @ 12:00
  day_month_date                : %A, %B %e                     : Monday, 15 October
  default                       : %Y-%m-%d                      : 15-10-2012
  long                          : %B %d, %Y                     : 15 October 2012
  month_day                     : %m/%d                         : 10-15
  short                         : %b %d                         : 15 Oct
  title_endian                  : %d %b %Y                      : 15 Oct 2012

i18n.rake

  desc "Show sample dates and times"
  task :show_sample_dates_and_times, [:locale] => [:environment] do |t, args|
    I18n.with_locale args.locale do
      puts "time:"
      (I18n.t :"time.formats", :locale => :en).to_a.sort.each do |format_sym, format_string|
        puts "  #{format_sym.to_s.ljust(30)}: #{format_string.ljust(30)}: #{I18n.l(Time.now, :format => format_sym)}"
      end

      puts "date:"
      (I18n.t :"date.formats", :locale => :en).to_a.sort.each do |format_sym, format_string|
        puts "  #{format_sym.to_s.ljust(30)}: #{format_string.ljust(30)}: #{I18n.l(Date.current, :format => format_sym)}"
      end
    end
  end