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diff -Naru old/ntpshmwrite.c new/ntpshmwrite.c
--- old/ntpshmwrite.c 2021-03-01 05:18:28.833952716 -0600
+++ new/ntpshmwrite.c 2021-03-01 05:19:48.361954319 -0600
@@ -40,11 +40,18 @@
* in Jun/Dec but may be in March or September
*/
(void)gmtime_r( &(td->real.tv_sec), &tm);
+/* This code contradicts page 3 section 2.1 of ITU-R RV.460-6 that
+ * leap second may occur at the last second of a month, with
+ * preference for December and June, 2nd preference to March and
+ * September.
+ * https://www.itu.int/dms_pubrec/itu-r/rec/tf/R-REC-TF.460-6-200202-I!!PDF-E.pdf
+ */
+#ifdef NOTITU_R_TF_460_6
if ( 5 != tm.tm_mon && 11 != tm.tm_mon ) {
/* Not june, not December, no way */
leap_notify = LEAP_NOWARNING;
}
-
+#endif /* NOTITU_R_TF_460_6 */
/* we use the shmTime mode 1 protocol
*
* ntpd does this:
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