+///////////////////////////////////////////////////////////////////////////////
+// Name: src/common/time.cpp
+// Purpose: Implementation of time-related functions.
+// Author: Vadim Zeitlin
+// Created: 2011-11-26
+// RCS-ID: $Id: wxhead.cpp,v 1.11 2010-04-22 12:44:51 zeitlin Exp $
+// Copyright: (c) 2011 Vadim Zeitlin <vadim@wxwidgets.org>
+// Licence: wxWindows licence
+///////////////////////////////////////////////////////////////////////////////
+
+// ============================================================================
+// declarations
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// headers
+// ----------------------------------------------------------------------------
+
+// for compilers that support precompilation, includes "wx.h".
+#include "wx/wxprec.h"
+
+#ifdef __BORLANDC__
+ #pragma hdrstop
+#endif
+
+#include "wx/time.h"
+
+#ifndef WX_GMTOFF_IN_TM
+ // Define it for some systems which don't (always) use configure but are
+ // known to have tm_gmtoff field.
+ #if defined(__WXPALMOS__) || defined(__DARWIN__)
+ #define WX_GMTOFF_IN_TM
+ #endif
+#endif
+
+// ============================================================================
+// implementation
+// ============================================================================
+
+// returns the time zone in the C sense, i.e. the difference UTC - local
+// (in seconds)
+int wxGetTimeZone()
+{
+#ifdef WX_GMTOFF_IN_TM
+ // set to true when the timezone is set
+ static bool s_timezoneSet = false;
+ static long gmtoffset = LONG_MAX; // invalid timezone
+
+ // ensure that the timezone variable is set by calling wxLocaltime_r
+ if ( !s_timezoneSet )
+ {
+ // just call wxLocaltime_r() instead of figuring out whether this
+ // system supports tzset(), _tzset() or something else
+ time_t t = time(NULL);
+ struct tm tm;
+
+ wxLocaltime_r(&t, &tm);
+ s_timezoneSet = true;
+
+ // note that GMT offset is the opposite of time zone and so to return
+ // consistent results in both WX_GMTOFF_IN_TM and !WX_GMTOFF_IN_TM
+ // cases we have to negate it
+ gmtoffset = -tm.tm_gmtoff;
+
+ // this function is supposed to return the same value whether DST is
+ // enabled or not, so we need to use an additional offset if DST is on
+ // as tm_gmtoff already does include it
+ if ( tm.tm_isdst )
+ gmtoffset += 3600;
+ }
+ return (int)gmtoffset;
+#elif defined(__DJGPP__) || defined(__WINE__)
+ struct timeb tb;
+ ftime(&tb);
+ return tb.timezone*60;
+#elif defined(__VISUALC__)
+ // We must initialize the time zone information before using it (this will
+ // be done only once internally).
+ _tzset();
+
+ // Starting with VC++ 8 timezone variable is deprecated and is not even
+ // available in some standard library version so use the new function for
+ // accessing it instead.
+ #if wxCHECK_VISUALC_VERSION(8)
+ long t;
+ _get_timezone(&t);
+ return t;
+ #else // VC++ < 8
+ return timezone;
+ #endif
+#elif defined(WX_TIMEZONE) // If WX_TIMEZONE was defined by configure, use it.
+ return WX_TIMEZONE;
+#elif defined(__BORLANDC__) || defined(__MINGW32__) || defined(__VISAGECPP__)
+ return _timezone;
+#elif defined(__MWERKS__)
+ return 28800;
+#else // unknown platform -- assume it has timezone
+ return timezone;
+#endif // WX_GMTOFF_IN_TM/!WX_GMTOFF_IN_TM
+}
projects / wxWidgets.git / commitdiff
