So, the flip side to that is that sometimes you need to add one month to a date, because that sometimes how human systems are written.
By not providing a function that does that, you’re just pushing the confusion down to the developer, who is more likely to make terrible errors in the process, get frustrated, or use one of N different competing libraries, each of which chose a different answer.
Omitting functionality that can behave unintuitively in certain circumstances means leaving out a lot of functionality that people need.
Like, “decimal numbers” go pathological in certain cases. So do Unicode characters. Don’t even bother thinking about connecting to the network.
In Ruby (with ActiveSupport) I would do something like 4.days.from_now or 30.days.from_now.
If I really needed “one month from now” on some specific day of the month that not every month has I’d do:
def 31st_of_next_month
next_month = (Time.current.end_of_month + 1.day).beginning_of_month
day = next_month + 31.days
return day if day.month == next_month
# last day of month if no 31st
next_month.end_of_month.beginning_of_day
end
Disclaimer: I’m laying in bed typing this on mobile. The code probably sucks but I’m writing for illustrative purposes.
It seems really weird that there’s so much pushback against “date time math is tricky, read the manual to find out exactly which compromise your library chose”.
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So, the flip side to that is that sometimes you need to add one month to a date, because that sometimes how human systems are written.
By not providing a function that does that, you’re just pushing the confusion down to the developer, who is more likely to make terrible errors in the process, get frustrated, or use one of N different competing libraries, each of which chose a different answer.
Omitting functionality that can behave unintuitively in certain circumstances means leaving out a lot of functionality that people need.
Like, “decimal numbers” go pathological in certain cases. So do Unicode characters. Don’t even bother thinking about connecting to the network.
In Ruby (with ActiveSupport) I would do something like
4.days.from_nowor30.days.from_now.If I really needed “one month from now” on some specific day of the month that not every month has I’d do:
Disclaimer: I’m laying in bed typing this on mobile. The code probably sucks but I’m writing for illustrative purposes.
Why wouldn’t you just use the ruby functions for adding a month to a date?
https://ruby-doc.org/stdlib-2.5.1/libdoc/date/rdoc/Date.html#method-i-3C-3C
It seems really weird that there’s so much pushback against “date time math is tricky, read the manual to find out exactly which compromise your library chose”.