diff --git a/ChangeLog b/ChangeLog
index 171be67d98..289949a5b8 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -3,6 +3,11 @@ Thu Sep  7 23:27:05 2006  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 	* file.c (path_check_0, fpath_check): disable path check on cygwin.
 	  [ruby-talk:213074]
 
+Thu Sep  7 02:03:45 2006  Yukihiro Matsumoto  <matz@ruby-lang.org>
+
+	* time.c (time_to_s): adopt new date format using digits
+	  e.g. "2006-09-07 02:03:45 +9000".
+
 Thu Sep  7 01:54:22 2006  Yukihiro Matsumoto  <matz@ruby-lang.org>
 
 	* string.c (sym_equal): override.  check equivalence.
diff --git a/time.c b/time.c
index cb2ee465c4..c9be587c47 100644
--- a/time.c
+++ b/time.c
@@ -1198,30 +1198,32 @@ time_to_s(VALUE time)
     struct time_object *tobj;
     char buf[128];
     int len;
-    time_t off;
-    char buf2[32];
-    char sign = '+';
-#if !defined(HAVE_STRUCT_TM_TM_GMTOFF)
-    VALUE tmp;
-#endif
 
     GetTimeval(time, tobj);
     if (tobj->tm_got == 0) {
 	time_get_tm(time, tobj->gmt);
     }
-#if defined(HAVE_STRUCT_TM_TM_GMTOFF)
-    off = tobj->tm.tm_gmtoff;
-#else
-    tmp = time_utc_offset(time);
-    off = NUM2INT(tmp);
-#endif
-    if (off < 0) {
-	sign = '-';
-	off = -off;
+    if (tobj->gmt == 1) {
+	len = strftime(buf, 128, "%Y-%m-%d %H:%M:%S UTC", &tobj->tm);
+    }
+    else {
+	time_t off;
+	char buf2[32];
+	char sign = '+';
+#if defined(HAVE_STRUCT_TM_TM_GMTOFF)
+	off = tobj->tm.tm_gmtoff;
+#else
+	VALUE tmp = time_utc_offset(time);
+	off = NUM2INT(tmp);
+#endif
+	if (off < 0) {
+	    sign = '-';
+	    off = -off;
+	}
+	sprintf(buf2, "%%Y-%%m-%%d %%H:%%M:%%S %c%02d%02d",
+		sign, (int)(off/3600), (int)(off%3600/60));
+	len = strftime(buf, 128, buf2, &tobj->tm);
     }
-    sprintf(buf2, "%%a, %%b %%d %%Y %%H:%%M:%%S %c%02d%02d",
-	    sign, (int)(off/3600), (int)(off%3600/60));
-    len = strftime(buf, 128, buf2, &tobj->tm);
     return rb_str_new(buf, len);
 }