diff --git a/include/wx/datetime.h b/include/wx/datetime.h
index 42d9e4f926..2f331299ad 100644
--- a/include/wx/datetime.h
+++ b/include/wx/datetime.h
@@ -57,15 +57,21 @@ class WXDLLIMPEXP_BASE wxDateSpan;
 #define wxLocaltime_r localtime_r
 #else
 struct tm *wxLocaltime_r(const time_t*, struct tm*);
+#if !defined(__WINDOWS__)
+     // On Windows, localtime _is_ threadsafe!
 #warning using pseudo thread-safe wrapper for localtime to emulate localtime_r
 #endif
+#endif
 
 #ifdef HAVE_GMTIME_R
 #define wxGmtime_r gmtime_r
 #else
 struct tm *wxGmtime_r(const time_t*, struct tm*);
+#if !defined(__WINDOWS__)
+     // On Windows, gmtime _is_ threadsafe!
 #warning using pseudo thread-safe wrapper for gmtime to emulate gmtime_r
 #endif
+#endif
 
 /*
   The three (main) classes declared in this header represent:
diff --git a/src/common/datetime.cpp b/src/common/datetime.cpp
index 8448eb1a5e..12732e144b 100644
--- a/src/common/datetime.cpp
+++ b/src/common/datetime.cpp
@@ -169,6 +169,36 @@ wxCUSTOM_TYPE_INFO(wxDateTime, wxToStringConverter<wxDateTime> , wxFromStringCon
     #endif
 #endif // !WX_TIMEZONE && !WX_GMTOFF_IN_TM
 
+#if wxUSE_THREADS
+static wxMutex timeLock;
+#endif
+
+#ifndef HAVE_LOCALTIME_R
+struct tm *wxLocaltime_r(const time_t* ticks, struct tm* temp)
+{
+#if wxUSE_THREADS && !defined(__WINDOWS__)
+  // No need to waste time with a mutex on windows since it's using
+  // thread local storage for localtime anyway.
+  wxMutexLocker(timeLock);
+#endif
+  memcpy(temp, localtime(ticks), sizeof(struct tm));
+  return temp;
+}
+#endif
+
+#ifndef HAVE_GMTIME_R
+struct tm *wxGmtime_r(const time_t* ticks, struct tm* temp)
+{
+#if wxUSE_THREADS && !defined(__WINDOWS__)
+  // No need to waste time with a mutex on windows since it's
+  // using thread local storage for gmtime anyway.
+  wxMutexLocker(timeLock);
+#endif
+  memcpy(temp, gmtime(ticks), sizeof(struct tm));
+  return temp;
+}
+#endif
+
 // ----------------------------------------------------------------------------
 // macros
 // ----------------------------------------------------------------------------