如何在ruby中获取特定月份和年份的开始日期和结束日期？

Question

通过传递这些参数我想获得month和(1 to 12)，year值2011 to 2012和starting day值，如ending day特写month和year。我怎么能用红宝石做到这一点？

Answer 1

Date.civil听起来像你需要的那样

start_date = Date.civil(2011, 1, 1)  #=> Sat, 01 Jan 2011
end_date = Date.civil(2011, 12, -1)   #=> Sat, 31 Dec 2011

文档：here

Answer 2

除了jfornoff的出色答案外，Rails＆＃39; Active Support gem附带了丰富的date and time methods：

require 'active_support/core_ext/date' #to cherry pick just date helpers

d = Date.new(2011, 4)  #=> Fri, 01 Apr 2011

d.beginning_of_month   #=> Fri, 01 Apr 2011
d.end_of_month         #=> Sat, 30 Apr 2011
d.all_month            #=> Fri, 01 Apr 2011..Sat, 30 Apr 2011

Answer 3

require 'date' 

start_date = Date.new(2016, 2)
  #=> #<Date: 2016-02-01 ((2457420j,0s,0n),+0s,2299161j)> 
end_date = (start_date >> 1) - 1
  #=> #<Date: 2016-02-29 ((2457448j,0s,0n),+0s,2299161j)>