diff --git a/tests/test-diff-unified b/tests/test-diff-unified
--- a/tests/test-diff-unified
+++ b/tests/test-diff-unified
@@ -53,6 +53,6 @@ rm a
 echo b > a
 echo a >> a
 echo c >> a
-hg diff -U0 -p
+hg diff -U0 -p --nodates
 
 exit 0
diff --git a/tests/test-diff-unified.out b/tests/test-diff-unified.out
--- a/tests/test-diff-unified.out
+++ b/tests/test-diff-unified.out
@@ -50,8 +50,8 @@ abort: diff context lines count must be 
 % test off-by-one error with diff -p
 adding a
 diff -r cb9a9f314b8b a
---- a/a	Thu Jan 01 00:00:00 1970 +0000
-+++ b/a	Thu Nov 27 17:46:15 2008 +0000
+--- a/a
++++ b/a
 @@ -1,0 +1,1 @@
 +b
 @@ -2,0 +3,1 @@ a