--- httpd-2.2.22.original/server/core.c	2011-09-08 12:59:38.000000000 -0300
+++ httpd-2.2.22/server/core.c	2012-08-01 00:01:48.000000000 -0300
@@ -2334,6 +2334,39 @@
     return NULL;
 }
 
+
+static const char *ap_pstrftime(apr_pool_t *p, const char *format) {
+    size_t got, len = strlen(format) + 1;
+    const char *fp = strchr(format, '%');
+    char *buf = NULL;
+    apr_time_exp_t strftime_tm;
+    apr_time_exp_lt(&strftime_tm, apr_time_now());
+    while (NULL != fp) {
+        len += 10;
+        fp = strchr(fp + 1, '%');
+    }
+
+    buf = apr_palloc(p, len);
+    apr_strftime(buf, &got, len, format, &strftime_tm);
+    return buf;
+}
+
+static const char *set_error_log(cmd_parms *cmd, void *dummy,
+                                          const char *arg)
+{
+    const char *err = ap_check_cmd_context(cmd,
+                                           NOT_IN_DIR_LOC_FILE|NOT_IN_LIMIT);
+    if (err != NULL) {
+        return err;
+    }
+
+    char* error_fname;
+    error_fname = apr_pstrdup(cmd->pool,ap_pstrftime(cmd->pool, arg));
+    cmd->server->error_fname = error_fname;
+
+    return NULL;
+}
+
 /*
  * The ServerName directive takes one argument with format
  * [scheme://]fully-qualified-domain-name[:port], for instance
@@ -3394,8 +3427,7 @@
   "En-/disable server signature (on|off|email)"),
 AP_INIT_TAKE1("ServerRoot", set_server_root, NULL, RSRC_CONF | EXEC_ON_READ,
   "Common directory of server-related files (logs, confs, etc.)"),
-AP_INIT_TAKE1("ErrorLog", set_server_string_slot,
-  (void *)APR_OFFSETOF(server_rec, error_fname), RSRC_CONF,
+AP_INIT_TAKE1("ErrorLog", set_error_log, NULL, RSRC_CONF,
   "The filename of the error log"),
 AP_INIT_RAW_ARGS("ServerAlias", set_server_alias, NULL, RSRC_CONF,
   "A name or names alternately used to access the server"),