Consider below code:
dates = ["20th OCT 1232", "6th JUN 2019", "23th AUG 2017", "9th JAN 2015"]
def reformateDate(dates)
ans = []
dates.length.times do |i|
ans << (DateTime.parse(dates[i], '%d %b %Y').to_date)
end
ans
end
This function return array in below format:
[#<Date: 1232-10-20 ((2171339j,0s,0n),+0s,2299161j)>, #<Date: 2019-06-06 ((2458641j,0s,0n),+0s,2299161j)>, #<Date: 2017-08-23 ((2457989j,0s,0n),+0s,2299161j)>, #<Date: 2015-01-09 ((2457032j,0s,0n),+0s,2299161j)>]
But i want it to return array in this format:
["1232-10-20","2019-06-06","2017-08-23","2015-01-09"]
So how can i do this?
dates.map { |e| Date.parse(e).strftime('%Y-%m-%d') }
#=> ["1232-10-20", "2019-06-06", "2017-08-23", "2015-01-09"]
Change the template '%Y-%m-%d' according to your needs, see this for reference: Date#strftime.
Picking up the wise suggestion from Cary Swoveland.
Instead of Date.parse(e) you can use Date.strptime(e, '%dth %b %Y'), which works more or less the reverse of strftime. See Date#strptime. It follows a template ('%dth %b %Y') to interpret the original string as a date. Adding th to the template after %d (day), it converts properly the current format to a date object:
Date.strptime("20th OCT 1232", '%dth %b %Y') #=> #<Date: 1232-10-20 ((2171339j,0s,0n),+0s,2299161j)>
But, what if the date is '1st OCT 2018' or '23rd OCT 2018'? The template does not match, because it expects to find th and not st or rd.
To be ordinal suffix agnostic, comes in hand the method String#sub:
"20th OCT 1232".sub(/(?<=\d)\p{Alpha}+/, '') #=> "20 OCT 1232"
So, mixing all together, the best solution to be safe should be:
dates.map { |e| Date.strptime(e.sub(/(?<=\d)\p{Alpha}+/, ''), '%d %b %Y').strftime('%Y-%m-%d') }
Well, you're actually storing Date objects when you write:
ans << (DateTime.parse(dates[i], '%d %b %Y').to_date)
There's a couple of problems with this: First, the parenthesis don't do anything, so you can remove them. Second, what you're doing is parsing a string into a DateTime object, and then converting it into a Date object. Not really sure why you would do that, but I believe it's a mistake. If you want to convert this to a string by temporally using DateTime objects, consider using strftime, which will take the DateTime object and turn it into a string with a specific format. It would look like this:
ans << DateTime.parse(dates[i], '%d %b %Y').strftime('%Y-%m-%d')
I would do something like this:
require 'date'
def reformat_date(dates)
dates.map { |date| Date.parse(date).to_s }
end
dates = ["20th OCT 1232", "6th JUN 2019", "23th AUG 2017", "9th JAN 2015"]
reformat_date(dates)
#=> ["1232-10-20", "2019-06-06", "2017-08-23", "2015-01-09"]
Related
I got the following input from user
'Wed, 02 Nov 2016 19:00:00'.
How can I split this string for date and time and place in variables with ruby?
How can I get the same string from the variables then?
I look throw regexp and date docs on ruby.tried to write smth:
require 'date'
puts DateTime.strftime('Wed, 02 Nov 2016 19:00:00', '%a, %d %b %y %H:%M:%S')
got the error
test-2.rb:17:in `<main>': undefined method `strftime' for DateTime:Class (NoMethodError)
Did you mean? strptime
_strptime
Parse a time object
This code extracts a Time object and converts it back to a date, time and date_time string.
require 'time'
time = Time.parse("Wed, 02 Nov 2016 19:00:00")
date_str = time.strftime('%a, %d %b %Y') #=> "Wed, 02 Nov 2016"
time_str = time.strftime('%T') #=> "19:00:00"
datetime_str = time.strftime('%a, %d %b %Y %T') #=> "Wed, 02 Nov 2016 19:00:00"
Split the string directly
If you don't need a Time object, you can just split the string around the last space :
date, time = "Wed, 02 Nov 2016 19:00:00".split(/ (?=\S+$)/)
date # => "Wed, 02 Nov 2016"
time # => "19:00:00"
irb(main):001:0> require 'time'
=> true
irb(main):002:0> dt = DateTime.parse('Wed, 02 Nov 2016 19:00:00')
=> #<DateTime: 2016-11-02T19:00:00+00:00 ((2457695j,68400s,0n),+0s,2299161j)>
irb(main):003:0> dt_date = dt.strftime('%Y/%m/%d')
=> "2016/11/02"
irb(main):004:0> dt_time = dt.strftime('%H:%M:%S')
=> "19:00:00"
irb(main):005:0>
require 'time'
time = Time.parse("Wed, 02 Nov 2016 19:00:00")
p time #2016-11-02 19:00:00 +0000
p time.day #2
p time.month #11
p time.year #2016
You can parse the time like so by requiring the module time. It will take the string date provided by the user, and convert it to an actual date and time recognized by ruby. Then you can use the built in methods provided by the time module and store that data in to variables. I hope that answers your question.
I want to display dates in the format: short day of week, short month, day of month without leading zero but including "th", "st", "nd", or "rd" suffix.
For example, the day this question was asked would display "Thu Oct 2nd".
I'm using Ruby 1.8.7, and Time.strftime just doesn't seem to do this. I'd prefer a standard library if one exists.
Use the ordinalize method from 'active_support'.
>> time = Time.new
=> Fri Oct 03 01:24:48 +0100 2008
>> time.strftime("%a %b #{time.day.ordinalize}")
=> "Fri Oct 3rd"
Note, if you are using IRB with Ruby 2.0, you must first run:
require 'active_support/core_ext/integer/inflections'
You can use active_support's ordinalize helper method on numbers.
>> 3.ordinalize
=> "3rd"
>> 2.ordinalize
=> "2nd"
>> 1.ordinalize
=> "1st"
Taking Patrick McKenzie's answer just a bit further, you could create a new file in your config/initializers directory called date_format.rb (or whatever you want) and put this in it:
Time::DATE_FORMATS.merge!(
my_date: lambda { |time| time.strftime("%a, %b #{time.day.ordinalize}") }
)
Then in your view code you can format any date simply by assigning it your new date format:
My Date: <%= h some_date.to_s(:my_date) %>
It's simple, it works, and is easy to build on. Just add more format lines in the date_format.rb file for each of your different date formats. Here is a more fleshed out example.
Time::DATE_FORMATS.merge!(
datetime_military: '%Y-%m-%d %H:%M',
datetime: '%Y-%m-%d %I:%M%P',
time: '%I:%M%P',
time_military: '%H:%M%P',
datetime_short: '%m/%d %I:%M',
due_date: lambda { |time| time.strftime("%a, %b #{time.day.ordinalize}") }
)
>> require 'activesupport'
=> []
>> t = Time.now
=> Thu Oct 02 17:28:37 -0700 2008
>> formatted = "#{t.strftime("%a %b")} #{t.day.ordinalize}"
=> "Thu Oct 2nd"
Although Jonathan Tran did say he was looking for the abbreviated day of the week first followed by the abbreviated month, I think it might be useful for people who end up here to know that Rails has out-of-the-box support for the more commonly usable long month, ordinalized day integer, followed by the year, as in June 1st, 2018.
It can be easily achieved with:
Time.current.to_date.to_s(:long_ordinal)
=> "January 26th, 2019"
Or:
Date.current.to_s(:long_ordinal)
=> "January 26th, 2019"
You can stick to a time instance if you wish as well:
Time.current.to_s(:long_ordinal)
=> "January 26th, 2019 04:21"
You can find more formats and context on how to create a custom one in the Rails API docs.
Create your own %o format.
Initializer
config/initializers/srtftime.rb
module StrftimeOrdinal
def self.included( base )
base.class_eval do
alias_method :old_strftime, :strftime
def strftime( format )
old_strftime format.gsub( "%o", day.ordinalize )
end
end
end
end
[ Time, Date, DateTime ].each{ |c| c.send :include, StrftimeOrdinal }
Usage
Time.new( 2018, 10, 2 ).strftime( "%a %b %o" )
=> "Tue Oct 2nd"
You can use this with Date and DateTime as well:
DateTime.new( 2018, 10, 2 ).strftime( "%a %b %o" )
=> "Tue Oct 2nd"
Date.new( 2018, 10, 2 ).strftime( "%a %b %o" )
=> "Tue Oct 2nd"
I like Bartosz's answer, but hey, since this is Rails we're talking about, let's take it one step up in devious. (Edit: Although I was going to just monkeypatch the following method, turns out there is a cleaner way.)
DateTime instances have a to_formatted_s method supplied by ActiveSupport, which takes a single symbol as a parameter and, if that symbol is recognized as a valid predefined format, returns a String with the appropriate formatting.
Those symbols are defined by Time::DATE_FORMATS, which is a hash of symbols to either strings for the standard formatting function... or procs. Bwahaha.
d = DateTime.now #Examples were executed on October 3rd 2008
Time::DATE_FORMATS[:weekday_month_ordinal] =
lambda { |time| time.strftime("%a %b #{time.day.ordinalize}") }
d.to_formatted_s :weekday_month_ordinal #Fri Oct 3rd
But hey, if you can't resist the opportunity to monkeypatch, you could always give that a cleaner interface:
class DateTime
Time::DATE_FORMATS[:weekday_month_ordinal] =
lambda { |time| time.strftime("%a %b #{time.day.ordinalize}") }
def to_my_special_s
to_formatted_s :weekday_month_ordinal
end
end
DateTime.now.to_my_special_s #Fri Oct 3rd
I want to display dates in the format: short day of week, short month, day of month without leading zero but including "th", "st", "nd", or "rd" suffix.
For example, the day this question was asked would display "Thu Oct 2nd".
I'm using Ruby 1.8.7, and Time.strftime just doesn't seem to do this. I'd prefer a standard library if one exists.
Use the ordinalize method from 'active_support'.
>> time = Time.new
=> Fri Oct 03 01:24:48 +0100 2008
>> time.strftime("%a %b #{time.day.ordinalize}")
=> "Fri Oct 3rd"
Note, if you are using IRB with Ruby 2.0, you must first run:
require 'active_support/core_ext/integer/inflections'
You can use active_support's ordinalize helper method on numbers.
>> 3.ordinalize
=> "3rd"
>> 2.ordinalize
=> "2nd"
>> 1.ordinalize
=> "1st"
Taking Patrick McKenzie's answer just a bit further, you could create a new file in your config/initializers directory called date_format.rb (or whatever you want) and put this in it:
Time::DATE_FORMATS.merge!(
my_date: lambda { |time| time.strftime("%a, %b #{time.day.ordinalize}") }
)
Then in your view code you can format any date simply by assigning it your new date format:
My Date: <%= h some_date.to_s(:my_date) %>
It's simple, it works, and is easy to build on. Just add more format lines in the date_format.rb file for each of your different date formats. Here is a more fleshed out example.
Time::DATE_FORMATS.merge!(
datetime_military: '%Y-%m-%d %H:%M',
datetime: '%Y-%m-%d %I:%M%P',
time: '%I:%M%P',
time_military: '%H:%M%P',
datetime_short: '%m/%d %I:%M',
due_date: lambda { |time| time.strftime("%a, %b #{time.day.ordinalize}") }
)
>> require 'activesupport'
=> []
>> t = Time.now
=> Thu Oct 02 17:28:37 -0700 2008
>> formatted = "#{t.strftime("%a %b")} #{t.day.ordinalize}"
=> "Thu Oct 2nd"
Although Jonathan Tran did say he was looking for the abbreviated day of the week first followed by the abbreviated month, I think it might be useful for people who end up here to know that Rails has out-of-the-box support for the more commonly usable long month, ordinalized day integer, followed by the year, as in June 1st, 2018.
It can be easily achieved with:
Time.current.to_date.to_s(:long_ordinal)
=> "January 26th, 2019"
Or:
Date.current.to_s(:long_ordinal)
=> "January 26th, 2019"
You can stick to a time instance if you wish as well:
Time.current.to_s(:long_ordinal)
=> "January 26th, 2019 04:21"
You can find more formats and context on how to create a custom one in the Rails API docs.
Create your own %o format.
Initializer
config/initializers/srtftime.rb
module StrftimeOrdinal
def self.included( base )
base.class_eval do
alias_method :old_strftime, :strftime
def strftime( format )
old_strftime format.gsub( "%o", day.ordinalize )
end
end
end
end
[ Time, Date, DateTime ].each{ |c| c.send :include, StrftimeOrdinal }
Usage
Time.new( 2018, 10, 2 ).strftime( "%a %b %o" )
=> "Tue Oct 2nd"
You can use this with Date and DateTime as well:
DateTime.new( 2018, 10, 2 ).strftime( "%a %b %o" )
=> "Tue Oct 2nd"
Date.new( 2018, 10, 2 ).strftime( "%a %b %o" )
=> "Tue Oct 2nd"
I like Bartosz's answer, but hey, since this is Rails we're talking about, let's take it one step up in devious. (Edit: Although I was going to just monkeypatch the following method, turns out there is a cleaner way.)
DateTime instances have a to_formatted_s method supplied by ActiveSupport, which takes a single symbol as a parameter and, if that symbol is recognized as a valid predefined format, returns a String with the appropriate formatting.
Those symbols are defined by Time::DATE_FORMATS, which is a hash of symbols to either strings for the standard formatting function... or procs. Bwahaha.
d = DateTime.now #Examples were executed on October 3rd 2008
Time::DATE_FORMATS[:weekday_month_ordinal] =
lambda { |time| time.strftime("%a %b #{time.day.ordinalize}") }
d.to_formatted_s :weekday_month_ordinal #Fri Oct 3rd
But hey, if you can't resist the opportunity to monkeypatch, you could always give that a cleaner interface:
class DateTime
Time::DATE_FORMATS[:weekday_month_ordinal] =
lambda { |time| time.strftime("%a %b #{time.day.ordinalize}") }
def to_my_special_s
to_formatted_s :weekday_month_ordinal
end
end
DateTime.now.to_my_special_s #Fri Oct 3rd
Ruby 2.0
controller action
#date = "2013-12-21"
#new_date = #date.to_date
p #new_date
o/p: Sat, 21 Dec 2013
at view
<%= #new_date %>
o/p: 2013-12-21
i want on view "Sat, 21 Dec 2013"
Rails is so intelligent that it automatically calls all objects in a view that are not already a string via the method .to_s, which always converts the content of the object to a string.
Lets first dig me into the root cause, why such unexpected output :
kirti#kirti-Aspire-5733Z:~/workspace/testproject$ rvm use 1.9.3
Using /home/kirti/.rvm/gems/ruby-1.9.3-p484
kirti#kirti-Aspire-5733Z:~/workspace/testproject$ rails c
Loading development environment (Rails 3.2.16)
1.9.3p484 :001 > d = "2013-12-21".to_date
=> Sat, 21 Dec 2013
1.9.3p484 :002 > d.to_s
=> "2013-12-21"
1.9.3p484 :003 > d
=> Sat, 21 Dec 2013
1.9.3p484 :004 > d.class
=> Date
1.9.3p484 :005 > d.strftime('%a, %e %b %Y')
=> "Sat, 21 Dec 2013"
1.9.3p484 :006 >
"2013-12-21".to_date giving you a Date instance, not a String instance.d.class proved that. d is a Date instance, on which in view again to_s method is called as I told in the begining, so Sat, 21 Dec 2013 is again set back into the "2013-12-21". So your solution will be :
#date = "2013-12-21".to_date.strftime('%a, %e %b %Y')
"2013-12-21".to_date.strftime('%a, %e %b %Y') will give you the desired result as an String instance.So on string instance(receiver) if you apply to_s,you will get the same receiver back. Now you can use this #date variable in your view.
in Ruby 2.0 in a controller's action:
#date = "2013-12-21"
#new_date = #date.to_date
# => Sat, 21 Dec 2013
And use the #new_date on your view.
#new_date.strftime('%a, %e %b %Y')
Use it directly on the view.
From what I understand, you are getting
2013-12-21
but want
Sat, 21 Dec 2013
The reason it is outputted in the console nicely is because the console will auto format it for you. This can be verified by printing #new_date.to_s in the console, it'll be the unformatted version. To print it out on a screen in the way you want, you have to format it yourself.
You should use strftime like this:
#new_date = #new_date.strftime('%a, %e %b %Y')
or
#date.to_date.strftime('%a, %e %b %Y')
This will output Sat, 21 Dec 2013 correctly.
The best way to format a date object in Rails is by using the available I18n formatters.
<%= l # new_date, format: :long %>
As described in the guide, you can also create additional formats. For example, if none of the defaults matches your desired format, simply define
# config/locales/en.yml
en:
time:
formats:
custom: "%a, %e %b %Y"
then use
<%= l # new_date, format: :custom %>
I need to tell chronic that the format of date is day-month-year is that possible? The data I pass to chronic could also be words today/yesterday/2 days ago.
Currently chronic gives me 2 Dec 2010 instead of 12 Feb 2010 from 12-02-2010
The only solution I can think of is to swap day and month before passing the string to chronic.
require 'chronic'
puts "12-02-2010 = #{Chronic.parse('12-02-2010')}" #should be 12 Feb 2010
puts "yesteday = #{Chronic.parse('yesterday')}" #working ok
puts "Today = #{Chronic.parse('today')}" #working ok
I've found this question today, 20 months after it has been asked. It seems that there is a way to indicate to swap months and days. Just use the :endian_precedence option:
:endian_precedence (Array) — default: [:middle, :little] — By default,
Chronic will parse "03/04/2011" as the fourth day of the third month.
Alternatively you can tell Chronic to parse this as the third day of
the fourth month by altering the :endian_precedence to [:little,
:middle]
Example here:
Chronic.parse('12-02-2010').strftime('%d %b %Y') #=> 02 Dec 2010
Chronic.parse('12-02-2010', :endian_precedence => [:little, :median]).strftime('%d %b %Y') #=> 12 Feb 2010
Hope this helps!
Dorian
The output of chronic can be easily formatted. chronic.parse returns a time object. You can use strftime for formatting as described here.
puts Chronic.parse('today').strftime('%d %b %Y') #=> 23 Feb 2010
As far as the input is concerned, I cannot find anything in chronic that will do it automatically. Manipulating the input string is probably the way to go.
Edit: Chronic has an internal pre_normalize that you could over-ride..
require 'chronic'
puts Chronic.parse('12-02-2010').strftime('%d %b %Y') #=> 02 Dec 2010
module Chronic
class << self
alias chronic__pre_normalize pre_normalize
def pre_normalize(text)
text = text.split(/[^\d]/).reverse.join("-") if text =~ /^\d{1,2}[^\d]\d{1,2}[^\d]\d{4}$/
text = chronic__pre_normalize(text)
return text
end
end
end
puts Chronic.parse('12-02-2010').strftime('%d %b %Y') #=> 12 Feb 2010