获取特定工作日的最接近日期 [英] Get the closest date of a specific week day

问题描述

我有个约会，例如，我想找到最近的星期四.尽管我希望它可以在任何工作日工作，而不仅仅是星期四.

I have a date and I want to find the closest Thursday for instance. Though I want it to work for any week day, not just Thursday.

为避免混淆，我不希望下一个星期四，我想要上一个或下一个星期四，以最近的一个为准.因此它必须是双向的.

To avoid confusion, I don't want the next Thursday, I want either the previous or next Thursday, whichever is the closest. So it has to be bidirectional.

我已经写了一个能做到这一点的代码，但是我显然对while循环感到不满意，我想知道你们是否对更好的实现有一个想法.

I have written a code that does it but I'm clearly not happy with the while loop and I was wondering if you guys had an idea of a better implementation.

def closest_date(date, wday)

  # already ok
  return date if date.wday == wday

  before_date = date
  after_date = date

  until before_date.wday == wday && after_date.wday == wday
    before_date -= 1.day unless before_date.wday == wday
    after_date += 1.day unless after_date.wday == wday
  end

  if (date - before_date).to_i > (after_date - date).to_i
    return after_date
  else
    return before_date
  end

end

推荐答案

这就是我要做的:

def closest_day(weekday_name,date=Date.today)
  distance = Date.parse(weekday_name).cwday - date.cwday
  (date + (distance.abs < 4 ? distance : 7 - distance.abs).days)
end

例如， weekday_name 是" thursday ".

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