Index: b/unix/xserver/hw/vnc/buildtime.c
===================================================================
--- a/unix/xserver/hw/vnc/buildtime.c
+++ b/unix/xserver/hw/vnc/buildtime.c
@@ -15,4 +15,4 @@
  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,
  * USA.
  */
-char buildtime[] = __DATE__ " " __TIME__;
+char buildtime[] = "??? ?? ???? ??:??:??";
Index: b/unix/vncconfig/buildtime.c
===================================================================
--- a/unix/vncconfig/buildtime.c
+++ b/unix/vncconfig/buildtime.c
@@ -15,4 +15,4 @@
  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,
  * USA.
  */
-char buildtime[] = __DATE__ " " __TIME__;
+char buildtime[] = "??? ?? ???? ??:??:??";
Index: b/unix/x0vncserver/buildtime.c
===================================================================
--- a/unix/x0vncserver/buildtime.c
+++ b/unix/x0vncserver/buildtime.c
@@ -15,4 +15,4 @@
  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,
  * USA.
  */
-char buildtime[] = __DATE__ " " __TIME__;
+char buildtime[] = "??? ?? ???? ??:??:??";
Index: b/win/winvnc/buildTime.cxx
===================================================================
--- a/win/winvnc/buildTime.cxx
+++ b/win/winvnc/buildTime.cxx
@@ -15,4 +15,4 @@
  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,
  * USA.
  */
-const char* buildTime = "Built on " __DATE__ " at " __TIME__;
+const char* buildTime = "Built on ??? ?? ???? at ??:??:??";
Index: b/CMakeLists.txt
===================================================================
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -42,10 +42,6 @@ if(MSVC)
   message(FATAL_ERROR "TigerVNC cannot be built with Visual Studio.  Please use MinGW")
 endif()
 
-if(NOT BUILD_TIMESTAMP)
-  STRING(TIMESTAMP BUILD_TIMESTAMP "%Y-%m-%d %H:%M" UTC)
-endif()
-
 # Default to optimised builds instead of debug ones. Our code has no bugs ;)
 # (CMake makes it fairly easy to toggle this back to Debug if needed)
 if(NOT CMAKE_BUILD_TYPE)
Index: b/vncviewer/vncviewer.cxx
===================================================================
--- a/vncviewer/vncviewer.cxx
+++ b/vncviewer/vncviewer.cxx
@@ -98,11 +98,9 @@ static const char *about_text()
   // time.
   snprintf(buffer, sizeof(buffer),
            _("TigerVNC Viewer %d-bit v%s\n"
-             "Built on: %s\n"
              "Copyright (C) 1999-%d TigerVNC Team and many others (see README.rst)\n"
              "See https://www.tigervnc.org for information on TigerVNC."),
-           (int)sizeof(size_t)*8, PACKAGE_VERSION,
-           BUILD_TIMESTAMP, 2019);
+           (int)sizeof(size_t)*8, PACKAGE_VERSION, 2019);
 
   return buffer;
 }