ruby-on-rails - 如何在ruby中获取下个月的第一天？

Question

我有手术日期。我想创建有以下内容的本票:

day=1
month= the next month of operation_date
year= automatic

示例:

operation_date = 15/11/2010 
promissory_note1_date = 1/12/2010
promissory_note2_date = 1/01/2011
promissory_note3_date = 1/02/2011
promissory_note4_date = 1/02/2011

如果存在四张期票

我怎样才能做到呢？

PD:请原谅我的语法

Answer 1

你可以做到

require "active_support"

require "active_support/core_ext/date/calculations"
# || require "active_support/all"

Date.today.at_beginning_of_month
#=> Wed, 01 Dec 2010

Date.today.at_beginning_of_month.next_month
#=> Sat, 01 Jan 2011

Date.today.at_beginning_of_month.next_month.next_month
#=> Tue, 01 Feb 2011

等等...

引用文献

Rails guide 3.0 - 6.1.4 - ActiveSupport - How to Load Core Extensions
Rails guide 3.0 - 6.1.4 - ActiveSupport - Extensions to date