Re: [Vala] Date format

[rastersoft <raster rastersoft com>]

Yes, this looks very promising; unfortunately, it seems that Vala has 
not an VAPI for it. I searched for it in the documentation and in 
/usr/share/vala*/vapi, but I've been not able to find it :(

El 25/10/11 22:37, Reid Thompson escribió:
>  From the bottom of this page
> http://www.gnu.org/s/hello/manual/libc/The-Elegant-and-Fast-Way.html
>
> you would just need to query for the default format using
>   nl_langinfo (D_T_FMT)
> check it, and then configure your output to match except with YYYY in
> place of YY.
>
> An example of nl_langinfo usage is a function which has to print a given date and time in a locale-specific 
> way. At first one might think that, since strftime internally uses the locale information, writing something 
> like the following is enough:
>
> size_t
>       i18n_time_n_data (char *s, size_t len, const struct tm *tp)
>       {
>         return strftime (s, len, "%X %D", tp);
>       }
>
> The format contains no weekday or month names and therefore is
> internationally usable. Wrong! The output produced is something like
> "hh:mm:ss MM/DD/YY". This format is only recognizable in the USA. Other
> countries use different formats. Therefore the function should be
> rewritten like this:
>
> size_t
>       i18n_time_n_data (char *s, size_t len, const struct tm *tp)
>       {
>         return strftime (s, len, nl_langinfo (D_T_FMT), tp);
>       }
>
> Now it uses the date and time format of the locale selected when the
> program runs. If the user selects the locale correctly there should
> never be a misunderstanding over the time and date format.
>
>
> reid
> On Tue, 2011-10-25 at 22:06 +0200, rastersoft wrote:
> > Thanks, but that doesn't solve my problem. I already got access to that,
> > and tested format("%x"); unfortunately, it puts the year as a two-digit
> > number.
> >
> > I want the same than format("%x") but with four-digit years; the problem
> > is how to know if the current locale mandates to write month/day/year or
> > day/month/year.
> >
> > Currently I do a check at program startup, doing format("%x") for date
> > day 1, month 3, year 2005, and check the output: if there's a 3 as the
> > first number, then the order is month/day/year; if not, it's
> > day/month/year. Unfortunately, that's an extremely ugly hack. So I want
> > to know if is there a straightforward way of doing this.
> >
> > Thanks.
> >
> > El 25/10/11 15:35, Reid Thompson escribió:
> > > On Mon, 2011-10-24 at 22:33 +0200, rastersoft wrote:
> > > > I want to print a date in the format dd/mm/yyyy or mm/dd/yyyy,
> > > > acording
> > > slightly modified from http://live.gnome.org/Vala/TimeSample
> > >
> > > void main () {
> > >
> > >       // A DateTime from a Unix timestamp
> > >       int64 timestamp = 1234151912;
> > >       var time = new DateTime.from_unix_utc (timestamp);
> > >       // convert back to Unix timestamp
> > >       assert (time.to_unix () == timestamp);
> > >
> > >       // A DateTime from year, month, day, hour, minute, second
> > >       time = new DateTime.utc (2010, 10, 22, 9, 22, 0);
> > >
> > >       // The current time in local timezone
> > >       var now = new DateTime.now_local ();
> > >       print ("Is daylight savings time: %s\n", now.is_daylight_savings () ? "yes" : "no");
> > >       print ("The timezone abbreviation is: %s\n", now.get_timezone_abbreviation ());
> > >
> > >       // returns time in RFC 3339 format: 2010-10-21T23:48:03+0200
> > >       string date_string = now.to_string ();
> > >       print ("Current time in RFC 3339 format: %s\n", date_string);
> > >
> > >       // for example, according to the current locale
> > >       print ("According to the current locale: %s\n", now.format ("%x %X"));
> > >
> > >       print ("Day of month: %d\n", now.get_day_of_month ());
> > >       print ("Week of year: %d\n", now.get_week_of_year ());
> > >
> > >       // Add one day, three hours and five minutes to a DateTime:
> > >       var future = now.add_days (1).add_hours (3).add_minutes (5);
> > >       print (@"Plus one day, three hours and five minutes: $future\n");
> > >
> > >
> > >       print ("According to the current locale: %s\n", now.format ("%d/%m/%Y"));
> > >       print ("According to the current locale: %s\n", now.format ("%m/%d/%Y"));
> > >
> > > }

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                         RASTER    (Linux user #228804)
raster rastersoft com              http://www.rastersoft.com