Rails: How I can get yesterday's date?
Ruby on-RailsRubyRuby on-Rails Problem Overview
How can I get yesterday's date?
maybe:
@get_time_now = Time.now.strftime('%m/%d/%Y') / 86400
or
@get_time_now = Time.now.strftime('%m/%d/%Y') - 1.day
or
@get_time_now = Time.now. / 86400
86400 = 1 day, right? (60 * 60 * 24)
Ruby on-Rails Solutions
Solution 1 - Ruby on-Rails
Rails
For a date object you could use:
Date.yesterday
Or a time object:
1.day.ago
Ruby
Or outside of rails:
require 'date'
Date.today.prev_day
Solution 2 - Ruby on-Rails
After trying 1.day.ago and variants on it:
irb(main):005:0> 1.day.ago
NoMethodError: undefined method `day' for 1:Fixnum
if found that Date.today.prev_day works for me:
irb(main):016:0> Date.today.prev_day
=> #<Date: 2013-04-09 ((2456392j,0s,0n),+0s,2299161j)>
Solution 3 - Ruby on-Rails
Time.now - (3600 * 24) # or Time.now - 86400
or
require 'date'
Date.today.prev_day
Solution 4 - Ruby on-Rails
Ruby 2.1.2 Native Time
Answer:
Time.at(Time.now.to_i - 86400)
Proof:
2.1.2 :016 > Time.now
=> 2014-07-01 13:36:24 -0400
2.1.2 :017 > Time.now.to_i
=> 1404236192
2.1.2 :018 > Time.now.to_i - 86400
=> 1404149804
2.1.2 :019 > Time.at(Time.now.to_i - 86400)
=> 2014-06-30 13:36:53 -0400
One Day of Seconds.
86400 = 1 day (60 * 60 * 24)
Solution 5 - Ruby on-Rails
Use Date.today - 1.days.
Date.yesterday depends on the current time and your offset from GMT
1.9.3-p125 :100 > Date.today
=> Wed, 29 Feb 2012
1.9.3-p125 :101 > Date.yesterday
=> Wed, 29 Feb 2012
1.9.3-p125 :102 > Date.today - 1.days
=> Tue, 28 Feb 2012
Solution 6 - Ruby on-Rails
use DateTime.now - 1
1.9.3p194 :040 > DateTime.now
=> Mon, 18 Nov 2013 17:58:45 +0530
1.9.3p194 :041 > DateTime.now - 1
=> Sun, 17 Nov 2013 17:58:49 +0530
or DateTime.yesterday
1.9.3p194 :042 > DateTime.yesterday
=> Sun, 17 Nov 2013
or we can use rails advance method for Time and DateTime
1.9.3p194 :043 > Time.now.advance(days: -1)
=> 2013-11-17 17:59:36 +0530
1.9.3p194 :044 > DateTime.now.advance(days: -1)
=> Sun, 17 Nov 2013 17:59:49 +0530
advance method also provides this options :years, :months, :weeks, :days, :hours, :minutes, :seconds
Solution 7 - Ruby on-Rails
You can just subtract 86400 from a Time object to get one day before. If you are using Rails, or have ActiveSupport included, you can replace 86400 with 1.days.
If you're using a Date object, and not a Time object, just subtract 1 from it.
To check if one date/time is before/after another, just compare the two objects like you would do for numbers:
DateTime.parse("2009-05-17T22:38:42-07:00") < DateTime.parse("2009-05-16T22:38:42-07:00")
# => false