Index: subversion/libsvn_subr/time.c
===================================================================
--- subversion/libsvn_subr/time.c   (revision 6)
+++ subversion/libsvn_subr/time.c   (working copy)
@@ -27,6 +27,8 @@
 #include "svn_utf.h"
 #include "svn_error.h"
 
+#include "svn_config.h"
+#include "svn_private_config.h"
 
 
 /*** Code. ***/
@@ -229,6 +231,11 @@
   apr_size_t len, retlen;
   apr_status_t ret;
   char *datestr, *curptr, human_datestr[SVN_TIME__MAX_LENGTH];
+  svn_error_t *err;
+  apr_hash_t *config;
+  svn_config_t *cfg;
+  const char *val;
+  char *human_timestamp_format_suffix_val;
 
   /* Get the time into parts */
   apr_time_exp_lt (&exploded_time, when);
@@ -256,11 +263,46 @@
   /* Calculate offset to the end of the machine parseable part. */
   curptr = datestr + len;
 
+  /* get SVN_CONFIG_OPTION_HUMAN_TIMESTAMP_FORMAT_SUFFIX option */
+  /* Make room for human_timestamp_format_suffix_val */
+  human_timestamp_format_suffix_val = apr_palloc (pool, SVN_TIME__MAX_LENGTH);
+  /* Make a default value for human_timestamp_format_suffix_val */
+  apr_cpystrn(human_timestamp_format_suffix_val, 
+              human_timestamp_format_suffix,
+              SVN_TIME__MAX_LENGTH);
+  /* Read human-timestamp-format-suffix option from config */            
+  err = svn_config_get_config (&config, NULL, pool);
+  if (!err)
+    {
+      cfg = config ? apr_hash_get (config, SVN_CONFIG_CATEGORY_CONFIG,
+                                   APR_HASH_KEY_STRING) : NULL;
+      if (cfg)
+        {
+          svn_config_get (cfg, &val,
+                          SVN_CONFIG_SECTION_MISCELLANY,
+                          SVN_CONFIG_OPTION_HUMAN_TIMESTAMP_FORMAT_SUFFIX,
+                          NULL);
+          if (val)
+            {
+              if (val[0])
+                {
+                  /* Option is a nonempty string.
+                     Append space to beginning of a string */
+                  apr_snprintf(human_timestamp_format_suffix_val,
+                               SVN_TIME__MAX_LENGTH, " %s", val);
+                 }
+              else
+                /* Option is an empty string.
+                   Human explanatory part will be an empty string */
+                *human_timestamp_format_suffix_val = '\0';
+            }
+        }
+    }
   /* Put in human explanatory part */
   ret = apr_strftime (human_datestr,
                       &retlen,
                       SVN_TIME__MAX_LENGTH - len,
-                      human_timestamp_format_suffix,
+                      human_timestamp_format_suffix_val,
                       &exploded_time);
   
   /* If there was an error, ensure that the string is zero-terminated. */
@@ -269,7 +311,6 @@
   else
     {
       const char *utf8_string;
-      svn_error_t *err;
 
       err = svn_utf_cstring_to_utf8 (&utf8_string, human_datestr, pool);
       if (err)
Index: subversion/libsvn_subr/config_file.c
===================================================================
--- subversion/libsvn_subr/config_file.c    (revision 7)
+++ subversion/libsvn_subr/config_file.c    (working copy)
@@ -1184,6 +1184,12 @@
         APR_EOL_STR
         "# use-commit-times = yes"
         APR_EOL_STR
+        "### Set human-timestamp-format-suffix"
+        APR_EOL_STR
+        "### It can be an empty string."
+        APR_EOL_STR
+        "#human-timestamp-format-suffix=(%a, %d %b %Y)"
+        APR_EOL_STR
         "### Set no-unlock to prevent 'svn commit' from automatically"
         APR_EOL_STR
         "### releasing locks on files."