如何知道今天的日期是否在日期范圍內？

Question

我有一個start_time和end_time的事件，想要檢查事件是否“正在進行中”。 那將是檢查今天的日期是否在兩個日期之間的范圍內。

你會如何在一個函數中做到這一點？

Answer 1

在Ruby 1.9.2 ===不起作用，我收到一個錯誤：

irb(main):019:0> (Time.now .. (Time.now+1)) === Time.now
TypeError: can't iterate from Time
    from (irb):19:in `each'
    from (irb):19:in `include?'
    from (irb):19:in `include?'
    from (irb):19:in `==='
    from (irb):19
    from /opt/ruby192/bin/irb:12:in `<main>'

而是使用#cover? ：

irb(main):002:0> (Time.now..Time.now+4).cover?(Time.now)
=> true
irb(main):003:0> (Time.now..Time.now+4).cover?(Time.now+10)
=> false

Answer 2

使用===

---

實際上，有一個運營商會這樣做。 使用===運算符創建一個Range並將Time對象與它進行比較。

start   = Time.now.to_i

range   = start..(start + 2)
inside  = start + 1
outside = start + 3        # ok, now...

range === inside  # true
range === outside # false

---

^{更新post-comment-flood：此版本適用於所有地方。 （在Rails中，在Ruby 1中，在Ruby 2中。）早期的irb示例也工作正常，但在某些實驗中並不總是正確地再現交互式示例。 這個更容易切割和粘貼。}

^{它現在全部理順了。}

Answer 3

如果你正在使用Rails，你可以TimeWithZone#between?使用TimeWithZone#between? 。 你會有這樣的事情：

> start_time = Time.zone.parse('12pm')      => Thu, 26 Jul 2012 12:00:00 EDT -04:00
> end_time = start_time + 1.hour            => Thu, 26 Jul 2012 13:00:00 EDT -04:00
> inside = Time.zone.parse('12:30pm')       => Thu, 26 Jul 2012 12:30:00 EDT -04:00
> outside = Time.zone.parse('1:30pm')       => Thu, 26 Jul 2012 13:30:00 EDT -04:00
> inside.between?(start_time, end_time)     => true
> outside.between?(start_time, end_time)    => false

Answer 4

因為日期類包含Comparable模塊，所以每個日期對象between?都有一個between? 方法。

require 'date'

today           = Date.today
tomorrow        = today + 1
one_month_later = today >> 1

tomorrow.between?(today, one_month_later) # => true

Answer 5

如果您使用Rails，您可以嘗試這樣做：

ruby-1.8.7-p299 :015 > a = DateTime.now
 => Fri, 02 Dec 2011 11:04:24 -0800 
ruby-1.8.7-p299 :016 > (a.beginning_of_day..a.end_of_day).include_with_range? a
 => true 
ruby-1.8.7-p299 :017 > (a.beginning_of_day..a.end_of_day).include_with_range? a+10.days
 => false 
ruby-1.8.7-p299 :018 > (a.beginning_of_day..a.end_of_day).include_with_range? a+25.hours
 => false 
ruby-1.8.7-p299 :019 > (a.beginning_of_day..a.end_of_day).include_with_range? a+2.hours
 => true 

注：我只是用beginning_of_day和end_of_day提供一個簡單的范圍。 重要的部分是include_with_range? 范圍上的方法。

Answer 6

如果他們是時間戳：

def in_progress?
  (start_time..end_time).include?(Time.now)
end

Answer 7

已檢查是兩個日期之間的當前日期。 使用Ruby

currentDate = DateTime.now
start_date = "2017-03-31"
end_date = "2018-03-31"
currentDate.between?(start_date, end_date)

**Out Put Will be** true or false

Answer 8

摘要

  d1      = DateTime.parse('2018/04/01')
  d2      = DateTime.parse('2018/04/29')
  outside = DateTime.parse('2018/04/30')
  inside  = DateTime.parse('2018/04/15')

  # include?
  (d1...d2).include?(d1)      # true
  (d1...d2).include?(d2)      # false
  (d1...d2).include?(outside) # false
  (d1...d2).include?(inside)  # true

  (d1..d2).include?(d1)      # true
  (d1..d2).include?(d2)      # true
  (d1..d2).include?(outside) # false
  (d1..d2).include?(inside)  # true

  # ===
  (d1...d2) === d1      # true
  (d1...d2) === d2      # false
  (d1...d2) === outside # false
  (d1...d2) === inside  # true

  (d1..d2) === d1      # true
  (d1..d2) === d2      # true
  (d1..d2) === outside # false
  (d1..d2) === inside  # true

  # cover?
  (d1...d2).cover?(d1)      # true
  (d1...d2).cover?(d2)      # false
  (d1...d2).cover?(outside) # false
  (d1...d2).cover?(inside)  # true

  (d1..d2).cover?(d1)      # true
  (d1..d2).cover?(d2)      # true
  (d1..d2).cover?(outside) # false
  (d1..d2).cover?(inside)  # true

  # between?
  d1.between?(d1, d2)       # true
  d2.between?(d1, d2)       # true
  outside.between?(d1, d2)  # false
  inside.between?(d1, d2)   # true