Use time_t for UNIX timestamps

WARNING: This breaks the ABI!

src/tools/qdatetime.cpp

@@ -1997,7 +1997,7 @@ TQDateTime::TQDateTime( const TQDate &date, const TQTime &time )
     \sa setTime_t()
 */
 
-uint TQDateTime::toTime_t() const
+time_t TQDateTime::toTime_t() const
 {
     tm brokenDown;
     brokenDown.tm_sec = t.second();
@@ -2007,10 +2007,10 @@ uint TQDateTime::toTime_t() const
     brokenDown.tm_mon = d.month() - 1;
     brokenDown.tm_year = d.year() - 1900;
     brokenDown.tm_isdst = -1;
-    int secsSince1Jan1970UTC = (int) mktime( &brokenDown );
+    time_t secsSince1Jan1970UTC = mktime( &brokenDown );
     if ( secsSince1Jan1970UTC < -1 )
 	secsSince1Jan1970UTC = -1;
-    return (uint) secsSince1Jan1970UTC;
+    return secsSince1Jan1970UTC;
 }
 
 /*!
@@ -2020,7 +2020,7 @@ uint TQDateTime::toTime_t() const
     based on the given UTC time.
 */
 
-void TQDateTime::setTime_t( uint secsSince1Jan1970UTC )
+void TQDateTime::setTime_t( time_t secsSince1Jan1970UTC )
 {
     setTime_t( secsSince1Jan1970UTC, TQt::LocalTime );
 }
@@ -2037,9 +2037,9 @@ void TQDateTime::setTime_t( uint secsSince1Jan1970UTC )
 
     \sa toTime_t()
 */
-void TQDateTime::setTime_t( uint secsSince1Jan1970UTC, TQt::TimeSpec ts )
+void TQDateTime::setTime_t( time_t secsSince1Jan1970UTC, TQt::TimeSpec ts )
 {
-    time_t tmp = (time_t) secsSince1Jan1970UTC;
+    time_t tmp = secsSince1Jan1970UTC;
     tm *brokenDown = 0;
 
 #if defined(Q_OS_UNIX) && defined(QT_THREAD_SUPPORT) && defined(_POSIX_THREAD_SAFE_FUNCTIONS)