From: Daniel Schierbeck <daniel.schierbeck@...>
Date: 2005-11-13T04:27:15+09:00
Subject: Re: Converting between Time and DateTime

Lloyd Zusman wrote:
> What is the recommended method for converting between Time objects and
> those of type DateTime?
> 
> I know that I can do this:
> 
>   dt = DateTime.new
>   t = Time.mktime(dt.year, dt.mon, dt.day,
>                   dt.hour, dt.min, dt.sec)
> 
> .. and this:
> 
>   t = Time.now
>   dt = DateTime.civil(t.year, t.mon, t.day,
>                       t.hour, t.min, t.sec)
> 
> However, this seems overly verbose to me, and I end up putting one or
> both of the following into my ruby programs:
> 
>   class DateTime
>     def self.fromTime(t)
>       return DateTime.civil(t.year, t.mon, t.day,
>                             t.hour, t.min, t.sec)
>     end
>   end
> 
>   class Time
>     def self.fromDateTime(dt)
>       return Time.mktime(dt.year, dt.mon, dt.day,
>                          dt.hour, dt.min, dt.sec)
>     end
>   end
> 
> Is there any reason for why we can't have similar methods as part of the
> official DateTime and Time classes?
> 
> Or is there already some sort of mechanism for this that I have
> overlooked?
> 
> Thanks in advance.
> 
> 
I think this would be more Rubyish:

   class DateTime
     def to_time
       Time.mktime(year, mon, day, hour, min, sec)
     end
   end

   class Time
     def to_datetime
       DateTime.civil(year, mon, day, hour, min, sec)
     end
   end

I haven't tested it, but it should work.


Cheers,
Daniel