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20041015: Bug in ut_calendar?

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  • Subject: 20041015: Bug in ut_calendar?
  • Date: Tue, 19 Oct 2004 10:58:32 -0600
Mary,

>Date: Mon, 18 Oct 2004 17:42:01 -0600 (MDT)
>From: Mary Haley <address@hidden>
>To: Steve Emmerson <address@hidden>
>Subject: Re: 20041015: Bug in ut_calendar?

The above message contained the following:

> I tried this new version, and it worked on the case where time=0. But,
> it exhibits strange results for time = 1,2, etc.  I've
> attached a new program that shows this.
> 
> Can you try this on your version of Udunits?
> 
> thanks,
> 
> --Mary
...
> #include <stdio.h>
> #include <udunits.h>
> 
> void main()
> {
>   int utret;
>   int utopen();
>   utUnit unit;
> 
>   double time[5] = {0.,1.,2.,3.,4.};
>   int i, year, month, day, hour, minute;
>   char *units = "months since 1870-1-1";
>   float second;
> 
>   utret = utInit("udunits.dat");
>   (void)utScan(units, &unit);
> 
>   for(i = 0; i < 5; i++ ) {
>     (void) utCalendar(time[i],&unit,&year,&month,&day,
>                       &hour,&minute,&second);
>     
>     printf("units = '%s'\n",units);
>     printf("time  = %g\n", time[i]);
>     printf("year  = %d\n", year);
>     printf("month = %d\n", month);
>     printf("day   = %d\n", day);
>     printf("hour  = %d\n", hour);
>     printf("second= %g\n", second);
>     printf("\n");
>   }
> 
>   utTerm();
> }

I get the following from the above program:

    units = 'months since 1870-1-1'
    time  = 0
    year  = 1870
    month = 1
    day   = 1
    hour  = 0
    second= 0

    units = 'months since 1870-1-1'
    time  = 1
    year  = 1870
    month = 1
    day   = 31
    hour  = 10
    second= 3.83122

    units = 'months since 1870-1-1'
    time  = 2
    year  = 1870
    month = 3
    day   = 2
    hour  = 20
    second= 7.66245

    units = 'months since 1870-1-1'
    time  = 3
    year  = 1870
    month = 4
    day   = 2
    hour  = 7
    second= 11.4937

    units = 'months since 1870-1-1'
    time  = 4
    year  = 1870
    month = 5
    day   = 2
    hour  = 17
    second= 15.3249

This seems correct to me.

Are you thinking that a "month" is a variable unit (i.e., is a variable
amount of time)?

Regards,
Steve Emmerson