On Oct 2, 9:06 am, Colin Law <[email protected]> wrote:
> 2009/10/2 Robert Walker <[email protected]>:
>
>
>
> > Colin Law wrote:
> >> If you have the local time in a known time zone put it into a ruby
> >> Time object (which, confusingly, includes a date) then you can use
> >> dst? to determine whether it is in dst or not.
>
> > Cool. I hadn't had a chance to go looking for a method in Ruby to
> > determine dst. I knew one exited in Java. It's good to know that .dst?
> > is the ticket. Do you know whether Ruby maintains it's own timezones
> > database or asks the host OS to look it up from the system's database?
>
> Don't know. I guess the system or Ruby would have to be updated
> regularly to keep it up to date, DST dates keep changing.
>
>
The tzinfo gem is regularly updated based on a public domain database
of dst rules etc (http://www.twinsun.com/tz/tz-link.htm)
Fred
>
> >> Time object (which, confusingly, includes a date)
> > Confusing to some maybe, but anyone who has ever done any serious date
> > math knows that time is meaningless apart from date.
>
> When there is also a DateTime class it is confusing.
>
> The discussion has been had many times before, but there are times
> when a TimeOfDay class would be useful without a date. For an alarm
> that goes off at the same time every day for example.
>
>
>
> > After years in existence the Java folks still aren't completely happy
> > with the standard Date and Time objects. In fact it's been redone
> > several times, and still people often dump the standard classes in favor
> > of Joda time. It might sound simple, but in reality it's far from it.
>
> Definitely
>
> Colin
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