[Interest] Relashionship between time_t and QDateTime

Thiago Macieira thiago.macieira at intel.com
Tue Aug 27 21:38:46 CEST 2013

On terça-feira, 27 de agosto de 2013 22:17:07, Constantin Makshin wrote:
> In MSVC's runtime library — yes, gmtime() is broken.
> From MSDN (http://msdn.microsoft.com/en-us/library/vstudio/0z9czt0w.aspx):
> > Return Value
> > A pointer to a structure of type tm. The fields of the returned structure
> > hold the evaluated value of the timer argument in UTC rather than in
> > local time. Each of the structure fields is of type int, as follows: ...

> > tm_isdst
> > Always 0 for gmtime.

That does not show that it's broken. You've pasted the parts that show that 
gmtime does what it's supposed to do: convert from local time to GMT. Since 
GMT is never in daylight savings, tm_isdst will always be zero.

Thiago Macieira - thiago.macieira (AT) intel.com
  Software Architect - Intel Open Source Technology Center
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