diff --git a/modules/IntInfAsInt/Date.sml b/modules/IntInfAsInt/Date.sml
index 0a9aad9c..56afbfa5 100644
--- a/modules/IntInfAsInt/Date.sml
+++ b/modules/IntInfAsInt/Date.sml
@@ -1,35 +1,35 @@
 (*
     Title:      Rebuild the basis library: Date
-    Copyright   David C.J. Matthews 2016
+    Copyright   David C.J. Matthews 2016, 2020
 
     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Lesser General Public
     License version 2.1 as published by the Free Software Foundation.
     
     This library is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     Lesser General Public License for more details.
     
     You should have received a copy of the GNU Lesser General Public
     License along with this library; if not, write to the Free Software
     Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *)
 
 (* Date . *)
-useBasis "DateSignature";
+useBasis "DATE.sig";
 structure Date: DATE =
 struct
     open Date
     val date =
         fn { year, month, day, hour, minute, second, offset } =>
             date {year=FixedInt.fromLarge year, month=month, day=FixedInt.fromLarge day,
                   hour=FixedInt.fromLarge hour, minute=FixedInt.fromLarge minute,
                   second=FixedInt.fromLarge second, offset=offset}
     val year = FixedInt.toLarge o year
     and day  = FixedInt.toLarge o day
     and hour = FixedInt.toLarge o hour
     and minute = FixedInt.toLarge o minute
     and second = FixedInt.toLarge o second
     and yearDay = FixedInt.toLarge o yearDay
 end;