如何在Ruby中转换日期格式

Question

以下是一些输出结果：

Date.today  => Mon, 25 Jun 2012 
Date.today.to_formatted_s(:long_ordinal)  => "June 25th, 2012" 
Date.today.strftime('%A %d, %B')  =>  "Monday 25, June" 

现在我需要以以下格式输出：

  Monday 25th, June      or       Thrusday, 1st, October

问题在于to_formatted_s和strftime仅适用于日期，且两者都返回字符串。我该如何以所需的方式获取输出？

- Mohit Jain

Answer 1

你可以使用Date::DATE_FORMATS添加新的定制格式，使用Integer.ordinalize获取日期的序数：

Date::DATE_FORMATS[:month_ordinal] = lambda { |date| 
  date.strftime("%A #{date.day.ordinalize}, %B") 
}

>> Date.today.to_formatted_s(:month_ordinal)
=> "Monday 25th, June"

- Casper