Find the number of hours in a day

ruby-talk
1

I'm trying to determine the best way to find the number of hours (or
seconds) in a given day in a given timezone. Is there a "right" way to
do this with Ruby?

There are so many ways to deal with dates and times in Ruby (Time, date,
datetime, ActiveSupport:...:Time, Chronic, ActionView) that I almost
don't know where to start.

Basically, if there are 25 or 23 hours in a day due to daylight savings,
I need to know so that I can handle that special case. How would you
handle this?

···

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2

Hi --

I'm trying to determine the best way to find the number of hours (or
seconds) in a given day in a given timezone. Is there a "right" way to
do this with Ruby?

There are so many ways to deal with dates and times in Ruby (Time, date,
datetime, ActiveSupport:...:Time, Chronic, ActionView) that I almost
don't know where to start.

Basically, if there are 25 or 23 hours in a day due to daylight savings,
I need to know so that I can handle that special case. How would you
handle this?

I suspect there's a better way, probably already in a library
somewhere, but what occurs to me in the absence of knowing where is:

def seconds(day)
   Integer(day.tomorrow.midnight - day.midnight)
end

def hours(day)
   seconds(day) / 3600
end

(using ActiveSupport). I guess the Integer part might clash with leap
seconds, but you get the idea.

David

···

On Tue, 22 Sep 2009, Nick Brown wrote:

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David A. Black, Director
Ruby Power and Light, LLC (http://www.rubypal.com)
Ruby/Rails training, consulting, mentoring, code review
Book: The Well-Grounded Rubyist (http://www.manning.com/black2\)

3

Hi --

> I'm trying to determine the best way to find the number of hours (or
> seconds) in a given day in a given timezone. Is there a "right" way to
> do this with Ruby?
>
> There are so many ways to deal with dates and times in Ruby (Time, date,

I suspect there's a better way, probably already in a library
somewhere, but what occurs to me in the absence of knowing where is:

Dear Nick,

maybe this can help determine what places have daylight saving time at
a particular date:

http://tzinfo.rubyforge.org/

Best regards,

Axel

···

On Tue, 22 Sep 2009, Nick Brown wrote:

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