生成介于 Ruby / Rails 中的 2 个日期之间的商业周列表

Question

我正在尝试创建一个年周列表（相当于 mySQL 的 YEARWEEK(date,1)) 落在 Rails 中的两个日期值之间。如果开始-日期和结束日期在同一年。这是我的代码：

  campaign_start_date = "2013-08-02 06:59:00"
  campaing_end_date = "2013-09-01 06:59:00"

  start_year = DateTime.parse(campaign_start_date).cwyear
  start_week = "%04d%02d" % [start_year, DateTime.parse(campaign_start_date).cweek]

  end_year = DateTime.parse(campaing_end_date).cwyear
  end_week = "%04d%02d" % [end_year, DateTime.parse(campaing_end_date).cweek]

  if start_year == end_year
    (start_week..end_week).each{ |i| result << i }
  else
    # need to build a suitable logic here. to handle the case when duration spans over multiple years. for example started in 01-Nov-14 and ended in 01-May-15
  end

  return result

上面的日期值不会有问题，会落到if case，我得到的结果是：

[
  "201331",
  "201332",
  "201332",
  "201333",
  "201334",
  "201335"
]

这也是我想要的。但是，如果我的开始日期和结束日期值是这些，例如：

  campaign_start_date = "2014-07-23 06:59:00"
  campaing_end_date = "2015-03-01 06:59:00"

意味着在不同的年份下降，那么它需要与我在 if 条件下的逻辑不同，因为对于这些日期值（start_week=201430 和 end_week=201509） if 条件在这里不合适，因为它会生成 80 个值，这是错误的，因为这些日期之间的周数不是 80。需要帮助来开发 else 案例的逻辑。可能很容易，但现在我只是厌倦了更深入地挖掘它。

特别注意：解决方案要注意商业年和商业周（参考rails的.cwyear和.cweek函数）例如[=23的yearweek =] 将是 201553 而不是 201601

在这方面的任何帮助将不胜感激。

Answer 1

瓶颈是(start_week..end_week)范围。它显然经过百（因为我们是小数）：

 2014xx ⇒ 201452 ⇒ 201453 ⇒ ... ⇒ 201499 ⇒ 201500 ⇒ ...

您可能应该过滤您的范围，例如：

r = (start_week..end_week)
r.to_a.reject { |e| e[-2..-1].to_i > 52 }

根据您计算周数的方式（=-based，或 1-based），201500 也应该被过滤掉：/

r.to_a.select { |e| e[-2..-1].to_i.between? 1, 52 }

Answer 2

试试这个；无论年份是否相同，它都适用于任何一组日期：

campaign_start_date = "2014-07-23 06:59:00"
campaign_end_date = "2015-03-01 06:59:00"

start_date = DateTime.parse(campaign_start_date)
end_date = DateTime.parse(campaign_end_date)

while start_date < end_date
  puts "%04d%02d" % [start_date.cw_year, start_date.cweek]
  start_date = start_date + 7.days
end

Answer 3

感谢那些回复的人。我终于解决了这样的问题：

  campaign_weeks = []

  campaign_start_date = "2014-07-23 06:59:00" # or any date
  campaing_end_date = "2015-03-01 06:59:00" # or any date

  start_year = DateTime.parse(campaign_start_date).cwyear
  start_cweek_of_the_campaign = "%04d%02d" % [start_year, DateTime.parse(campaign_start_date).cweek]

  end_year = DateTime.parse(campaing_end_date).cwyear
  end_cweek_of_the_campaign = "%04d%02d" % [end_year, DateTime.parse(campaing_end_date).cweek]

  if start_year == end_year
    (start_cweek_of_the_campaign..end_cweek_of_the_campaign).each do |w|
      campaign_weeks << ("%04d%02d" % [start_year, w])
    end
  else
    (start_year..end_year).each do |y|
      first_cweek_number_of_the_year = (y == start_year) ? start_cweek_of_the_campaign : 1
      last_cweek_number_of_the_year = (y == end_year) ? end_cweek_of_the_campaign : DateTime.new(y, 12, 28).cweek
      (first_cweek_number_of_the_year .. last_cweek_number_of_the_year).each do |w|
        campaign_weeks << ("%04d%02d" % [y, w])
      end
    end
  end

  return campaign_weeks

注意：12 月 28 日总是在一年的最后 cweek/iso-week。一年中的最后一个 ISO 周是 52 或 53。

参考：http://en.wikipedia.org/wiki/ISO_week_date#Last_week

从这个答案中得到一些提示：Calculating the number of weeks in a year with Ruby

Answer 4

讨论有点晚了，但这是我用来获取两个日期之间的商业周数的方法：

def cweek_diff(start_date, end_date)
  return if end_date < start_date
  cweek_diff = (end_date.cweek - start_date.cweek) + 1
  cwyear_diff = end_date.cwyear - start_date.cwyear
  cyear_diff * 53 + cweek_diff - cwyear_diff
end

它在我的案例中非常有效。希望对您有所帮助 ;)

生成介于 Ruby / Rails 中的 2 个日期之间的商业周列表

Generate a list of commercial weeks falling between 2 dates in Ruby / Rails

ruby

ruby-on-rails

date

week-number