Date font adjustment.

texinputs/beamerthemetptnew.sty

@@ -424,7 +424,9 @@
   \leavevmode
   \tptbottombox{page in head/foot}{\tptleftbottomboxwidth}{%
     \usebeamertemplate{page in head/foot}%
-    \ifx\insertdate\@empty\else\hfill\insertdate\fi
+    \ifx\insertdate\@empty
+    \else\hfill\usebeamerfont{date in head/foot}\insertdate
+    \fi
   }%
   \hspace*{\tptbottomboxsep}%
   \tptbottombox{institute in head/foot}{\tptmidbottomboxwidth}{%