Create a test to log time since boot MONOTONIC_RAW or uptime
  and the REALTIME clock (UTC)
  Not real sure how the build should work.  To build logtime
  do bitbake -c devshell ntp
  Then cd clockstuff, and to:
  make logtime
==============================================================
diff -Naur old/clockstuff/logtime.c new/clockstuff/logtime.c
--- old/clockstuff/logtime.c	1969-12-31 18:00:00.000000000 -0600
+++ new/clockstuff/logtime.c	2017-01-27 16:55:46.420307603 -0600
@@ -0,0 +1,44 @@
+#include <time.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <stdarg.h>
+#include <syslog.h>
+/*
+ * Generate a log messages 4 times per second
+ * to verify leap second.  The CLOCK_MONOTONIC_RAW
+ * is the time since boot unaffected by adjustments.
+ *
+ * CLOCK_REALTIME is the UTC clock, which is affected
+ * by leap seconds.
+ *
+ * Program does not exit.
+ *
+ */
+main()
+{
+	openlog("CTST",0,LOG_LOCAL2);
+	while(1) {
+		struct timespec ts,unused,ep;
+		if (clock_gettime(CLOCK_MONOTONIC,&ts) == 0) {
+			
+			if(ts.tv_nsec < 750000000)
+				ts.tv_nsec += 250000000;
+			else {
+				ts.tv_nsec -= 750000000;
+				ts.tv_sec += 1;
+			}
+			clock_nanosleep(CLOCK_MONOTONIC,TIMER_ABSTIME,&ts,&unused);	
+		        clock_gettime(CLOCK_MONOTONIC_RAW,&ts);
+			ts.tv_nsec /= 1000000;
+		        clock_gettime(CLOCK_REALTIME,&ep);
+			ep.tv_nsec /= 1000000;
+			syslog(LOG_NOTICE,"epoch: %lu.%3.3ld  boot: %lu.%3.3ld",
+				ep.tv_sec,ep.tv_nsec,
+				ts.tv_sec,ts.tv_nsec);
+			
+		}
+		
+
+	}	
+
+}
diff -Naur old/clockstuff/Makefile.am new/clockstuff/Makefile.am
--- old/clockstuff/Makefile.am	2017-01-27 16:50:58.929973639 -0600
+++ new/clockstuff/Makefile.am	2017-01-27 16:53:22.625139584 -0600
@@ -1,7 +1,7 @@
 #AUTOMAKE_OPTIONS = ../ansi2knr no-dependencies
 AUTOMAKE_OPTIONS = 
-noinst_PROGRAMS = @PROPDELAY@ @CHUTEST@ @CLKTEST@
-EXTRA_PROGRAMS = propdelay chutest clktest
+noinst_PROGRAMS = @PROPDELAY@ @CHUTEST@ @CLKTEST@ @LOGTIME@
+EXTRA_PROGRAMS = propdelay chutest clktest logtime
 
 INCLUDES = -I$(top_srcdir)/include
 # We need -lm (and perhaps $(COMPAT) for propdelay, -lntp for {chu,clk}test
diff -Naur old/configure.ac new/configure.ac
--- old/configure.ac	2017-01-27 17:59:46.940532782 -0600
+++ new/configure.ac	2017-01-27 17:55:26.626841232 -0600
@@ -4115,6 +4115,7 @@
 AC_SUBST([PROPDELAY])	dnl Set to "propdelay"
 AC_SUBST([CHUTEST])	dnl Set to "chutest"
 AC_SUBST([CLKTEST])	dnl Set to "clktest"
+AC_SUBST([LOGTIME])	dnl Set to "logtime"
 
 AC_SUBST([MAKE_ADJTIMED])
 AC_MSG_CHECKING([if we want HP-UX adjtimed support])