[ruby-core:74526] [Ruby trunk Feature#12211] introduce Date#first_of_month and Date#last_of_month

Issue #12211 has been updated by Victor Shepelev.


IMHO, consistent approach would be "allow Date/Time to be rounded to any component", there are many uses for this. Maybe something like `ceil`/`floor`/`round` methods set with Symbol argument? Like `floor(:month)` and `ceil(:month)`?

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Feature #12211: introduce Date#first_of_month and Date#last_of_month
https://bugs.ruby-lang.org/issues/12211#change-57651

* Author: Shunichi Arai
* Status: Open
* Priority: Normal
* Assignee: 
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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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