[ruby-core:74583] [Ruby trunk Feature#12211] introduce Date#first_of_month and Date#last_of_month

Issue #12211 has been updated by Shunichi Arai.


Shyouhei Urabe wrote:
> Naming-wise, Rails (ActiveSupport) has Date#beginning_of_month.  That name can be more familiar to other devs.
> 
> I'm against floor(:month) and such, especially against Time class.  The concept of "the second that a day begins" is not that concrete when it relates to summer time.  I recommend you to stick this proposal to Date only.

I think Date#beginning_of_month is bit verbose but okay too. How about to have an alias to Date#first_of_month?

floor(:month) looks elegant, but I think it's bit counter-intuitive. How about Date#day(n), Date#wday(n), or Date#year(n) which create a new date object with diffrent day / wday / year?

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Feature #12211: introduce Date#first_of_month and Date#last_of_month
https://bugs.ruby-lang.org/issues/12211#change-57713

* Author: Shunichi Arai
* Status: Open
* Priority: Normal
* Assignee: 
----------------------------------------
Proposes new methods Date#first_of_month and Date#last_of_month which can be very helpful in reporting applications which need the first and the last day of a month very frequently.

~~~
class Date
    def first_of_month
      Date.new(year, month, 1)
    end
    def last_of_month
      next_month.first_of_month.prev_day
    end
end
~~~

Current way to do it `Date.new(date.year, date.month, 1)` is not elegant and short enough for this simple and common operation.




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