Calculate age in Date class
Seems like there's enough complexity in determining the right values and it's something a ton of apps have to address. I've seen a bunch of StackOverflow and other blog posts attempt to address this, not all of them accurately.
Specifically age would calculate the number of years since a person's birthdate (or how old they are).
So if today is 2018, 6, 28:
Date.new(2016, 3, 6).age #=> 2
Date.new(2016, 6, 29).age #=> 1
Updated by shevegen (Robert A. Heiler) over 3 years ago
I am not sure if .age() is a "proper name" or not, so I can't really decide
on that. But I specifically wanted to add two things:
a) not all names necessarily fit towards the ruby object model as-is. Ultimately
you have to ask matz about what fits and what does not fit, but several methods
in the active* ecosystem (the gems) do not make a lot of sense from a "pure"
OOP point of view, in my opinion. That is not to say that these methods never
make sense, mind you (when I suggested ... I think it was .append() or something,
I was not even aware of the active* ecosystem; I only noticed that from a twitter
message how ruby core adds active* stuff ... but I don't use rails etc.. so I
came from a completely different point of view, yet the suggestion seems to
have made sense to matz back then.)
So TL;DR, I think one has to decide on a case-by-case basis whether it fits or
not, API-wise that is.
b) as for your other comment, in regards to StackOverflow, but even more importantly,
what people use with ruby, I actually agree. I think if people keep on having the
same issue over and over again, it may be where the core of ruby could be improved.
Date/Time related stuff is something that I feel is coming up every now and then,
so in this general area I agree - also because I think it is something lots of
people use ruby with.
By the way, it may also help to add a description what the method .age() does,
because with a missing description, others have to fill in so it adds to their
burden of implementation. It's much easier for the core team to add methods
when there is a clear documentation associated with it - but it is your suggestion,
not mine, feel free to proceed in any way that you see fit.
I personally use the "poor man's approach", always calculating in seconds. :P
Updated by shan (Shannon Skipper) over 3 years ago
derosm2 (Mike DeRosa) wrote:
Date.new(2016, 3, 6).age #=> 2
It might be nice to be able to specify a unit of time other than year.
Date.new(2016, 3, 6).age #=> 2 Date.new(2016, 3, 6).age(:year) #=> 2 Date.new(2016, 3, 6).age(:century) #=> 0 Date.today.iso8601 #=> "2018-07-18" Date.new(2016, 3, 6).age(:month) #=> 28
Units might include :millenia, :century, :decade, :year, :month, :week, :day, :hour, :minute, :second, :millisecond, :microsecond and :nanosecond.
Updated by matz (Yukihiro Matsumoto) about 3 years ago
- Status changed from Open to Rejected
I don't think the calculation of age from the birthday is not a responsibility of
There may be a chance for the method for more generic duration calculation of dates/times.