Question

我正在使用Ruby和Ruby on Rails 4。

我想知道接下来两个月的每个月的第15天和最后一天的日期。

start_date = Time.now
mid_month = start_date.15th.day.of.month
last_day_of_month = start.last.day.of.month

使用Ruby或Rails实现此目的的最简单方法是什么？

Answer 1

我不确定这是否适用于Rails 4：

start_date = Date.today
  # => Wed, 06 Nov 2013
mid_month  = (start_date + 1.month).beginning_of_month + 14
  # => Sun, 15 Dec 2013
end_month  = (start_date + 1.month).end_of_month
  # => Tue, 31 Dec 2013

Answer 2

我认为你正在寻找以下内容：

require 'date'

d = Date.today
start_date = d-d.mday
p date_15 = start_date.next_day(15)
# => #<Date: 2013-11-15 ((2456612j,0s,0n),+0s,2299161j)>
p date_last = d.next_month - d.mday
# => #<Date: 2013-11-30 ((2456627j,0s,0n),+0s,2299161j)>

Answer 3

对于NEXT两个月：

start_date = Date.today

[1..2].each do |month_add|
  mid_month  = (start_date + month_add.month).beginning_of_month + 14
  end_month  = (start_date + month_add.month).end_of_month
  puts 'Month: #{month_add}'
  puts "Mid Month "+mid_month
  puts "End Month "+end_month
end

Answer 4

还有一些：

    start_date == Date.today

    beginning = start_date.beginning_of_month
    middle = beginning.advance(weeks:2)
    end = start_date.end_of_month

看起来更具人性化。

所有这些方法都可以从ActiveSupport类扩展中获得，因此如果不使用Rails

，则必须包含它

Answer 5

可能有一些更简单的方法，但我想到了这一点：

require 'Date'

start_date   = Date.today
mid_month    = Date.new(start_date.year, start_date.month, 15)
end_of_month = Date.new(start_date.year, start_date.month+1, 1)-1
#or
end_of_month = Date.new(start_date.year, start_date.month, 1).next_month.prev_day

我怎样才能获得每个月的第15天和最后一天？

5 个答案: