my old draft of wxDateTime

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@4715 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/datetime.cpp

@@ -0,0 +1,146 @@
+/////////////////////////////////////////////////////////////////////////////
+// Name:        wx/datetime.h
+// Purpose:     implementation of time/date related classes
+// Author:      Vadim Zeitlin
+// Modified by:
+// Created:     11.05.99
+// RCS-ID:      $Id$
+// Copyright:   (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
+// Licence:     wxWindows license
+/////////////////////////////////////////////////////////////////////////////
+
+// ============================================================================
+// declarations
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// headers
+// ----------------------------------------------------------------------------
+
+#ifdef __GNUG__
+    #pragma implementation "datetime.h"
+#endif
+
+// For compilers that support precompilation, includes "wx.h".
+#include "wx/wxprec.h"
+
+#ifdef __BORLANDC__
+    #pragma hdrstop
+#endif
+
+#ifndef WX_PRECOMP
+    #include "wx/string.h"
+    #include "wx/intl.h"
+    #include "wx/log.h"
+#endif // WX_PRECOMP
+
+#include "wx/datetime.h"
+
+// ============================================================================
+// implementation of wxDateTime
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// static data
+// ----------------------------------------------------------------------------
+
+Country wxDateTime::ms_country;
+wxDateTime wxDateTime::ms_InvDateTime;
+
+// ----------------------------------------------------------------------------
+// constructors and assignment operators
+// ----------------------------------------------------------------------------
+
+wxDateTime& wxDateTime::Set(const struct tm& tm)
+{
+    time_t timet = mktime(tm);
+    if ( timet == (time_t)(-1) )
+    {
+        wxFAIL_MSG(_T("Invalid time"));
+
+        return ms_InvDateTime;
+    }
+    else
+    {
+        return Set(timet);
+    }
+}
+
+wxDateTime& wxDateTime::Set(wxDateTime_t hour,
+                            wxDateTime_t minute,
+                            wxDateTime_t second,
+                            wxDateTime_t millisec)
+{
+    // we allow seconds to be 61 to account for the leap seconds, even if we
+    // don't use them really
+    wxCHECK_MSG( hour < 24 && second < 62 && minute < 60 && millisec < 1000,
+                 ms_InvDateTime,
+                 _T("Invalid time in wxDateTime::Set()") );
+
+    // get the current date from system
+    time_t timet = GetTimeNow();
+    struct tm *tm = localtime(&timet);
+
+    // adjust the time
+    tm->tm_hour = hour;
+    tm->tm_min = minute;
+    tm->tm_sec = second;
+
+    (void)Set(tm);
+
+    // and finally adjust milliseconds
+    return SetMillisecond(millisec);
+}
+
+wxDateTime& wxDateTime::Set(wxDateTime_t day,
+                            Month        month,
+                            int          year,
+                            wxDateTime_t hour,
+                            wxDateTime_t minute,
+                            wxDateTime_t second,
+                            wxDateTime_t millisec)
+{
+    wxCHECK_MSG( hour < 24 && second < 62 && minute < 60 && millisec < 1000,
+                 ms_InvDateTime,
+                 _T("Invalid time in wxDateTime::Set()") );
+
+    if ( year == Inv_Year )
+        year = GetCurrentYear();
+    if ( month == Inv_Month )
+        month = GetCurrentMonth();
+
+    wxCHECK_MSG( day < GetNumberOfDays(month, year), ms_InvDateTime,
+                 _T("Invalid date in wxDateTime::Set()") );
+
+    // the range of time_t type (inclusive)
+    static const int yearMinInRange = 1970;
+    static const int yearMaxInRange = 2037;
+
+    // test only the year instead of testing for the exact end of the Unix
+    // time_t range - it doesn't bring anything to do more precise checks
+    if ( year >= yearMaxInRange && year <= yearMaxInRange )
+    {
+        // use the standard library version if the date is in range - this is
+        // probably much more efficient than our code
+        struct tm tm;
+        tm.tm_year = year;
+        tm.tm_mon = month;
+        tm.tm_mday = day;
+        tm.tm_hour = hour;
+        tm.tm_min = minute;
+        tm.tm_sec = second;
+
+        (void)Set(tm);
+
+        // and finally adjust milliseconds
+        return SetMillisecond(millisec);
+    }
+    else
+    {
+        // do time calculations ourselves: we want to calculate the number of
+        // milliseconds between the given date and the epoch (necessarily
+        // negative)
+    }
+
+    return *this;
+}