Count number of days between two dates
RubyRuby Problem Overview
How do I count the number of days between these two dates?
start_date = Date.parse "2012-03-02 14:46:21 +0100"
end_date = Date.parse "2012-04-02 14:46:21 +0200"
Ruby Solutions
Solution 1 - Ruby
With the Date (and DateTime) classes you can do (end_date - start_date).to_i to get the number of days difference.
Solution 2 - Ruby
Assuming that end_date and start_date are both of class ActiveSupport::TimeWithZone in Rails, then you can use:
(end_date.to_date - start_date.to_date).to_i
Solution 3 - Ruby
Rails has some built in helpers that might solve this for you. One thing to keep in mind is that this is part of the Actionview Helpers, so they wont be available directly from the console.
Try this
<% start_time = "2012-03-02 14:46:21 +0100" %>
<% end_time = "2012-04-02 14:46:21 +0200" %>
<%= distance_of_time_in_words(start_time, end_time) %>
"about 1 month"
Solution 4 - Ruby
I kept getting results in seconds, so this worked for me:
(Time.now - self.created_at) / 86400
Solution 5 - Ruby
to get the number of days in a time range (just a count of all days)
(start_date..end_date).count
(start_date..end_date).to_a.size
#=> 32
to get the number of days between 2 dates
(start_date...end_date).count
(start_date...end_date).to_a.size
#=> 31
Solution 6 - Ruby
None of the previous answers (to this date) gives the correct difference in days between two dates.
The one that comes closest is by thatdankent. A full answer would convert to_i and then divide:
(Time.now.to_i - 23.hours.ago.to_i) / 86400
>> 0
(Time.now.to_i - 25.hours.ago.to_i) / 86400
>> 1
(Time.now.to_i - 1.day.ago.to_i) / 86400
>> 1
In the question's specific example, one should not parse to Date if the time passed is relevant. Use Time.parse instead.
Solution 7 - Ruby
To have the number of whole days between two dates (DateTime objects):
((end_at - start_at).to_f / 1.day).floor
Solution 8 - Ruby
Solution 9 - Ruby
The best solution currently that I've seen work consistently well is using the following pattern:
(end_date.beginning_of_day - Time.now.utc.beginning_of_day).seconds.in_days
Solution 10 - Ruby
To get the number of days difference by two dates:
(start.to_date...end.to_date).count - 1
or
(end.to_date - start.to_date).to_i
Solution 11 - Ruby
(end_date - start_date)/1000/60/60/24
any one have best practice please comment below
Solution 12 - Ruby
def business_days_between(date1, date2)
business_days = 0
date = date2
while date > date1
business_days = business_days + 1 unless date.saturday? or date.sunday?
date = date - 1.day
end
business_days
end