I think timestamp>ymd just ignores the timezone information, and should
produce the same output (in fact I think implemented the exact same way) as
your timestamp>YMD.
On Thu, Sep 4, 2014 at 9:44 AM, Georg Simon <georg.si...@auge.de> wrote:
> If I do understand the Factor code
> ymd>timestamp correctly uses gmt but timestamp>ymd uses local time.
> So in Germany in summer
> today dup timestamp>ymd ymd>timestamp time- duration>hours .
> prints -2
> Does that mean there is a bug in timestamp>ymd ?
>
> I my application I want to use date strings of the local time. So I am
> thinking about local time versions. To get words that are not very long
> I replaced ymd by YMD. timestamp>YMD forgets the gmt-offset and
> YMD>timestamp expects a local date string and makes a timestamp with
> timezone information like the words yesterday and today.
> ( YMD>timestamp replaces local-ymd>timestamp from yesterday )
>
> USING:
> calendar calendar.format calendar.format.macros
> io.streams.string typed
> ;
> IN: localDateString
>
> TYPED: timestamp>YMD ( timestamp: timestamp -- str )
> [ { YYYY "-" MM "-" DD } formatted ] with-string-writer
> ;
> : YMD>timestamp ( str -- timestamp )
> [ read-ymd 0 0 0 gmt-offset-duration <timestamp> ]
> with-string-reader
> ;
> Now
> today >gmt "2014-08-31" YMD>timestamp time- duration>days .
> today "2014-08-31" YMD>timestamp time- duration>days .
> today dup timestamp>YMD YMD>timestamp time- duration>hours .
> print 4 4 0 respectively which is what I wanted.
>
> > Oh, I see -- you want to compare a date in local time with a date in
> > GMT without considering the timezone difference.
> >
> > Your solution seems okay, albeit a little complicated by trying to
> > undo the notion of timezones. Perhaps as you play with it a bit ,
> > you might have some idea of improvements to the API. We were trying
> > to preserve timezone information as much as possible, so for example
> > as you convert a YMD to a timestamp, it assumes GMT. Later, as you
> > use it, the timezone is included for time differences and other words.
>
>
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