From a8611821d75c4de4831f482c1746bf756a601a8c Mon Sep 17 00:00:00 2001
From: Thomas Gellekum <tg@FreeBSD.org>
Date: Mon, 8 Jan 1996 08:45:11 +0000
Subject: [PATCH] Fix leap year calculations in parse_to_unixtime()

---
 usr.sbin/xntpd/parse/parse.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/usr.sbin/xntpd/parse/parse.c b/usr.sbin/xntpd/parse/parse.c
index 713d3e6ace6c..d283b662f880 100644
--- a/usr.sbin/xntpd/parse/parse.c
+++ b/usr.sbin/xntpd/parse/parse.c
@@ -605,7 +605,9 @@ parse_iodone(parseio)
 /*
  * convert a struct clock to UTC since Jan, 1st 1970 0:00 (the UNIX EPOCH)
  */
-#define dysize(x)	((x) % 4 ? 365 : ((x % 400) ? 365 :366))
+#define dysize(x)	(((x) % 4) ? 365 : \
+                                    (((x) % 100) ? : 366 \
+                                                    (((x) % 400) ? 365 : 366)))
 
 time_t
 parse_to_unixtime(clock, cvtrtc)
@@ -649,8 +651,8 @@ parse_to_unixtime(clock, cvtrtc)
       return -1;		/* bad month */
     }
 				/* adjust leap year */
-  if (clock->month >= 3 && dysize(clock->year) == 366)
-      t++;
+  if (clock->month < 3 && dysize(clock->year) == 366)
+      t--;
 
   for (i = 1; i < clock->month; i++)
     {