Check if DateTime value is today, tomorrow or later

Question

I have an object attribute of the DateTime class.

How would I understand if the saved date is today, tomorrow or else later?

Alireza · Accepted Answer · 2014-10-26T22:58:21.987

81

Here are some useful ways to achieve it:

datetime = DateTime.now  => Sun, 26 Oct 2014 21:00:00

datetime.today? # => true
datetime.to_date.past? # => false (only based on date)
datetime.to_date.future? # => false  (only based on date)

datetime.to_date == Date.tomorrow # => false
datetime.to_date == Date.yesterday # => false

edited Oct 26 '14 at 22:58

answered Oct 26 '14 at 22:48

Alireza

2,641
17
18

4

This was probably in the context of a loaded ActiveSupport gem. There is no `today?` in the standard library. – ian Feb 05 '19 at 05:50
This is from Active Support but can also be used outside of Rails: `require 'active_support/core_ext/time/calculations'` (see https://guides.rubyonrails.org/active_support_core_extensions.html) – Ralf Ebert Nov 12 '19 at 16:02

score 8 · Answer 2 · answered Oct 26 '14 at 22:32

8

Something like...

datetime = Time.now.to_datetime
=> Sun, 26 Oct 2014 16:24:55 -0600 

datetime >= Date.today
=> true

datetime < Date.tomorrow
=> true

datetime += 1.day
=> Mon, 27 Oct 2014 16:25:12 -0600

datetime >= Date.today
=> true

datetime >= Date.tomorrow
=> true 

datetime < (Date.tomorrow + 1.day)
=> false

?

answered Oct 26 '14 at 22:32

Bob Mazanec

1,121
10
18

I though you nailed it but.. hm. In short I'd love the following to be true, but it isn't.. `DateTime.current == Date.current` – Fellow Stranger Oct 26 '14 at 22:39
1

`DateTime.current.to_date == Date.current`? – Bob Mazanec Oct 26 '14 at 22:45
Of course! :) (Just remove the dot in the DateTime class..) – Fellow Stranger Oct 26 '14 at 22:47
Oops -- yup -- fixed! – Bob Mazanec Oct 26 '14 at 22:48

score 4 · Answer 3 · answered Nov 16 '20 at 20:56

yesterday? & tomorrow? (Rails 6.1+)

Rails 6.1 adds new #yesterday? and #tomorrow? methods to Date and Time classes.

As a result, now, your problem can be solved as:

datetime = DateTime.current
# => Mon, 16 Nov 2020 20:50:16 +0000


datetime.today?
# => true

datetime.yesterday?
# => false

datetime.tomorrow?
# => false

It is also worth to mention that #yesterday? and #tomorrow? are aliased to #prev_day? and #next_day?.

Here is a link to the corresponding PR.

Check if DateTime value is today, tomorrow or later

3 Answers3

yesterday? & tomorrow? (Rails 6.1+)