Index: subversion/bindings/swig/perl/libsvn_swig_perl/swigutil_pl.c
===================================================================
--- subversion/bindings/swig/perl/libsvn_swig_perl/swigutil_pl.c	(revision 1767623)
+++ subversion/bindings/swig/perl/libsvn_swig_perl/swigutil_pl.c	(working copy)
@@ -470,9 +470,11 @@ svn_opt_revision_t *svn_swig_pl_set_revision(svn_o
             if (!end)
                 maybe_croak(("unknown opt_revision_t string \"%s\": "
                              "missing closing brace for \"{DATE}\"", input));
+            char saved = *end;
             *end = '\0';
             err = svn_parse_date (&matched, &tm,
                                   input + 1, apr_time_now(), pool);
+            *end = saved;
             if (err) {
                 svn_error_clear (err);
                 maybe_croak(("unknown opt_revision_t string \"{%s}\": "