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Date:	Thu, 24 Jan 2013 11:47:16 +0100
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Subject:	Re: Intel FORTRAN time_and_date function returns UTC instead of local time
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On 1/24/2013 11:01 AM, Marten Jan de Ruiter wrote:
>
> I wrote a FORTRAN program using the time_and_date function. The source follows below. The time_and_date function returns the wrong time: I am not in UTC, so czone should be +0100.
>
> In the following output, the lines "ctime:..." to "milliseconds..." are based on time_and_date. The line 15:54:49 is the correct time obtained by the time function, and the line 23-JAN-13 is the correct date obtained by the date function.
>
> ctime: 20130123
> cdate: 145449.947
> czone: -0000
> @ 2013-01-23 14:54:49.947
>   year                 2013
>   month                   1
>   day                    23
>   diff wrt UTC            0  minutes
>   hours                  14
>   minutes                54
>   seconds                49
>   milliseconds          947
>
>   15:54:49
>   23-JAN-13
>
>
> I have done some experiments to narrow down the problem:
> * compiling with gfortran: time_gfortran.exe gives correct result in Cygwin
> * compiling with g95: time_g95.exe gives the correct result in Cygwin

these two compilers are cygwin ones

> * compiling with ifort: time_ifort.exe gives the wrong time in Cygwin
this is not.

Take cygwin out of the loop, what is the answer of
time_ifort.exe in cmd ?


>
> After copying cygwin1.dll, cyggfortran-3.dll and cyggcc_s-1.dll to the working directory, I get correct results
> using the three executables in c:\windows\system32\cmd.exe.
>
> I suspect that the intel compiler does a different system call for time_and_date than for date and time, that the system call is intercepted by Cygwin, and not properly handled. I am still baffled why the same source runs fine for gfortran and g95. Notice however that for these compilers, the _date_ and _time_ functions are not defined. Hence the preprocessor exclusion in the source.

I doubt cygwin is intercepting a not cygwin program call to MS ssystem



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