How to know if today's date is in a date range?_问答_开发者

How to know if today's date is in a date range?

开发者 https://www.devze.com 2023-02-01 13:32 出处：网络

I have an event with start_time and end_time and want to check if t开发者_StackOverflow社区he event is \"in progress\". That would be to check if today\'s date is in the range between the two dates.

相关专题：date range ruby

I have an event with start_time and end_time and want to check if t开发者_StackOverflow社区he event is "in progress". That would be to check if today's date is in the range between the two dates.

How would you do this in a function?

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

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.
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
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
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.
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
If they're timestamps:

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