* time.c (find_time_t): use mktime for the first guess.

git-svn-id: http://svn.ruby-lang.org/repos/ruby/trunk@24718 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 10 insertions, 0 deletions

diff --git a/time.c b/time.c
index 8a680c9f1..edff7ee7a 100644
--- a/time.c
+++ b/time.c
@@ -1962,6 +1962,16 @@ find_time_t(struct tm *tptr, int utc_p, time_t *tp)
 
     find_dst = 0 < tptr->tm_isdst;
 
+#if defined(HAVE_MKTIME)
+    tm0 = *tptr;
+    if (!utc_p && (guess = mktime(&tm0)) != -1) {
+        tm = GUESS(&guess);
+        if (tm && tmcmp(tptr, tm) == 0) {
+            goto found;
+        }
+    }
+#endif
+
     tm0 = *tptr;
     if (tm0.tm_mon < 0) {
       tm0.tm_mon = 0;