No changes, just move time functions from wx/stopwatch.h to wx/time.h.

Preserve compatibility by including wx/time.h from wx/stopwatch.h but put all
the time-related functions in a more logical place.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@69838 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/time.h

@@ -18,4 +18,53 @@
  */
 int wxGetTimeZone();
 
+/**
+    Returns the number of seconds since local time 00:00:00 Jan 1st 1970.
+
+    @see wxDateTime::Now()
+
+    @header{wx/time.h}
+*/
+long wxGetLocalTime();
+
+/**
+    Returns the number of milliseconds since local time 00:00:00 Jan 1st 1970.
+
+    The use of wxGetUTCTimeMillis() is preferred as it provides a usually
+    (except for changes to the system time) monotonic clock which the local
+    time also changes whenever DST begins or ends.
+
+    @see wxDateTime::Now(), wxGetUTCTimeMillis(), wxGetUTCTimeUSec()
+
+    @header{wx/time.h}
+*/
+wxLongLong wxGetLocalTimeMillis();
+
+/**
+    Returns the number of seconds since GMT 00:00:00 Jan 1st 1970.
+
+    @see wxDateTime::Now()
+
+    @header{wx/time.h}
+*/
+long wxGetUTCTime();
+
+/**
+    Returns the number of milliseconds since GMT 00:00:00 Jan 1st 1970.
+
+    @header{wx/time.h}
+
+    @since 2.9.3
+ */
+wxLongLong wxGetUTCTimeMillis();
+
+/**
+    Returns the number of microseconds since GMT 00:00:00 Jan 1st 1970.
+
+    @header{wx/time.h}
+
+    @since 2.9.3
+ */
+wxLongLong wxGetUTCTimeUSec();
+
 //@}