计算两天之间的工作日数

Question

我需要计算两个日期之间的工作日数.我怎样才能使用Ruby(或者Rails ......如果有特定于Rails的帮助程序)来解决这个问题.

同样,我希望能够在指定日期添加工作日.

因此,如果一个日期在星期四下降,我增加了3个工作日,它将在下周二返回.

Answer 1

看看business_time.它可以用于你要问的两件事.

计算两个日期之间的工作日:

wednesday = Date.parse("October 17, 2018")
monday = Date.parse("October 22, 2018")
wednesday.business_days_until(monday) # => 3

将工作日添加到给定日期:

4.business_days.from_now
8.business_days.after(some_date)

历史答案

当最初询问这个问题时,business_time没有提供business_days_until方法,所以提供了以下方法来回答问题的第一部分.

这对于不需要任何其他功能的人来说仍然有用,business_time并且希望避免添加额外的依赖项.

def business_days_between(date1, date2)
  business_days = 0
  date = date2
  while date > date1
   business_days = business_days + 1 unless date.saturday? or date.sunday?
   date = date - 1.day
  end
  business_days
end

这也可以进行微调,以处理Tipx以您希望的方式提及的情况.

Answer 2

我们过去常常使用mikej的答案中建议的算法,并发现计算25,000 个数年的范围每个需要340秒.

这是另一种渐近复杂度为O(1)的算法.它在0.41秒内完成相同的计算.

# Calculates the number of business days in range (start_date, end_date]
#
# @param start_date [Date]
# @param end_date [Date]
#
# @return [Fixnum]
def business_days_between(start_date, end_date)
  days_between = (end_date - start_date).to_i
  return 0 unless days_between > 0

  # Assuming we need to calculate days from 9th to 25th, 10-23 are covered
  # by whole weeks, and 24-25 are extra days.
  #
  # Su Mo Tu We Th Fr Sa    # Su Mo Tu We Th Fr Sa
  #        1  2  3  4  5    #        1  2  3  4  5
  #  6  7  8  9 10 11 12    #  6  7  8  9 ww ww ww
  # 13 14 15 16 17 18 19    # ww ww ww ww ww ww ww
  # 20 21 22 23 24 25 26    # ww ww ww ww ed ed 26
  # 27 28 29 30 31          # 27 28 29 30 31
  whole_weeks, extra_days = days_between.divmod(7)

  unless extra_days.zero?
    # Extra days start from the week day next to start_day,
    # and end on end_date's week date. The position of the
    # start date in a week can be either before (the left calendar)
    # or after (the right one) the end date.
    #
    # Su Mo Tu We Th Fr Sa    # Su Mo Tu We Th Fr Sa
    #        1  2  3  4  5    #        1  2  3  4  5
    #  6  7  8  9 10 11 12    #  6  7  8  9 10 11 12
    # ## ## ## ## 17 18 19    # 13 14 15 16 ## ## ##
    # 20 21 22 23 24 25 26    # ## 21 22 23 24 25 26
    # 27 28 29 30 31          # 27 28 29 30 31
    #
    # If some of the extra_days fall on a weekend, they need to be subtracted.
    # In the first case only corner days can be days off,
    # and in the second case there are indeed two such days.
    extra_days -= if start_date.tomorrow.wday <= end_date.wday
                    [start_date.tomorrow.sunday?, end_date.saturday?].count(true)
                  else
                    2
                  end
  end

  (whole_weeks * 5) + extra_days
end

Answer 3

business_time具有您想要的所有功能.

从自述文件:

#you还可以计算两个日期之间的业务持续时间

friday = Date.parse("December 24, 2010")
monday = Date.parse("December 27, 2010")
friday.business_days_until(monday) #=> 1

将工作日添加到给定日期:

some_date = Date.parse("August 4th, 1969")
8.business_days.after(some_date) #=> 14 Aug 1969

Answer 4

这是我的（非宝石和非假日）工作日计数示例：

first_date = Date.new(2016,1,5)
second_date = Date.new(2016,1,12)
count = 0
(first_date...second_date).each{|d| count+=1 if (1..5).include?(d.wday)}
count