如何知道今天的日期是否在一个日期范围内？

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If they're timestamps:

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

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最佳答案

Use `===`

Actually, there is an operator that will do this. Make a Range and compare Time objects to it using the === operator.

start   = Time.now.to_i


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


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

^{Update post-comment-flood: This version works well everywhere. (In Rails, in Ruby 1, and in Ruby 2.) The earlier irb example also worked fine but the interactive example wasn't always reproduced correctly in some experiments. This one is easier to cut-and-paste.

It's all straightened out now.}

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In Ruby 1.9.2 === doesn't work, I get an error:

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>'

Instead use #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

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If you are using Rails, you could try this:

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

Note: I just used beginning_of_day and end_of_day to provide an easy range. The important part is the include_with_range? method on a Range.

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If you're using Rails you can use TimeWithZone#between?. You'd then have something like this:

> 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

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Because the date class includes the Comparable module, every date object has a between? method.

require 'date'


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


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

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Checked is current date in between two dates. Using 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

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summary

  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

如何知道今天的日期是否在一个日期范围内？

Use ===

Use `===`