Index: diff_tests.py
===================================================================
--- diff_tests.py	(revision 14458)
+++ diff_tests.py	(working copy)
@@ -17,7 +17,7 @@
 ######################################################################
 
 # General modules
-import string, sys, re, os.path
+import string, sys, re, os.path, datetime,time
 
 # Our testing module
 import svntest
@@ -1771,7 +1771,32 @@
       raise svntest.Failure
 
 
+# added diff with time option
+def diff_with_time_option(sbox):
+   "diff with time option"
+   sbox.build()
+   wc_dir =sbox.wc_dir
 
+   current_dir = os.getcwd()
+   os.chdir(sbox.wc_dir)
+
+   arg1 = time.strftime('%Y-%m-%d')
+   arg2 = time.strftime('%H:%M')
+   arg3 = time.strftime('%Y-%m-%d %H:%M')
+   arg4 = datetime.datetime.today().isoformat()
+
+   try:
+     svntest.actions.run_and_verify_svn(None,None,[],
+                                  'diff', '-r','{'+str(arg1)+'}')
+     svntest.actions.run_and_verify_svn(None,None,[],
+                                  'diff', '-r','{'+str(arg2)+'}')
+     svntest.actions.run_and_verify_svn(None,None,[],
+                                  'diff', '-r','{'+str(arg3)+'}')
+     svntest.actions.run_and_verify_svn(None,None,[],
+                                  'diff', '-r','{'+str(arg4)+'}')
+   finally:
+     os.chdir(current_dir)       
+
 ########################################################################
 #Run the tests
 
@@ -1803,7 +1828,8 @@
               diff_within_renamed_dir,
               diff_prop_on_named_dir,
               diff_keywords,
-              diff_force
+              diff_force,
+              diff_with_time_option
               ]
 
 if __name__ == '__main__':