Add a bunch of regression tests for time conversion.

This regression tests time conversion across various
limits, leap seconds, and daylight transistions.
gmtime_r, localtime_r, timegm, and mktime are
tested against themselves and expected outputs.

It requires the "posix" and "right" zoneinfo to be
installed on the test running machine in order to
access testable time zones. If those are not present
the test is skipped successfully with a warning.

2 files changed, 1736 insertions, 0 deletions

diff --git a/regress/lib/libc/time/time_conversion/Makefile b/regress/lib/libc/time/time_conversion/Makefile
new file mode 100644
index 00000000000..fa73d6acc05
--- /dev/null
+++ b/regress/lib/libc/time/time_conversion/Makefile
@@ -0,0 +1,11 @@
+#	$OpenBSD: Makefile,v 1.1 2022/11/06 12:57:08 beck Exp $
+
+PROG=		timetest
+SRCS=		timetest.c
+
+REGRESS_TARGETS=do-timetest
+
+do-timetest: ${PROG}
+	./${PROG}
+
+.include <bsd.regress.mk>
diff --git a/regress/lib/libc/time/time_conversion/timetest.c b/regress/lib/libc/time/time_conversion/timetest.c
new file mode 100644
index 00000000000..825315c4643
--- /dev/null
+++ b/regress/lib/libc/time/time_conversion/timetest.c
@@ -0,0 +1,1725 @@
+/*	$OpenBSD: timetest.c,v 1.1 2022/11/06 12:57:08 beck Exp $ */
+
+/*
+ * Copyright (c) 2022 Bob Beck <beck@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/stat.h>
+#include <sys/stdint.h>
+#include <sys/types.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+
+struct timetest {
+	char *descr;
+	char *timezone;
+	time_t time;
+	struct tm local_tm;
+	struct tm gmt_tm;
+};
+
+static int tm_match(struct tm * tm1, struct tm *tm2) {
+	if (tm2->tm_year != tm1->tm_year ||
+	    tm2->tm_mon != tm1->tm_mon ||
+	    tm2->tm_mday != tm1->tm_mday ||
+	    tm2->tm_hour != tm1->tm_hour ||
+	    tm2->tm_min != tm1->tm_min ||
+	    tm2->tm_sec != tm1->tm_sec ||
+	    tm2->tm_wday != tm1->tm_wday ||
+	    tm2->tm_yday != tm1->tm_yday ||
+	    tm2->tm_yday != tm1->tm_yday ||
+	    tm2->tm_isdst != tm1->tm_isdst ||
+	    tm2->tm_gmtoff != tm1->tm_gmtoff ||
+	    strcmp(tm2->tm_zone, tm1->tm_zone) != 0)
+		return 0;
+	return 1;
+}
+
+struct timetest timetests[] = {
+	{
+		.descr="moon",
+		.timezone="posix/America/Edmonton",
+		.time=-16751025,
+		.local_tm=		{
+			.tm_year=69,
+			.tm_mon=5,
+			.tm_mday=20,
+			.tm_hour=19,
+			.tm_min=56,
+			.tm_sec=15,
+			.tm_wday=5,
+			.tm_yday=170,
+			.tm_isdst=0,
+			.tm_gmtoff=-25200,
+			.tm_zone="MST"
+		},
+		.gmt_tm=		{
+			.tm_year=69,
+			.tm_mon=5,
+			.tm_mday=21,
+			.tm_hour=2,
+			.tm_min=56,
+			.tm_sec=15,
+			.tm_wday=6,
+			.tm_yday=171,
+			.tm_isdst=0,
+			.tm_gmtoff=0,
+			.tm_zone="GMT"
+		},
+	},
+	{
+		.descr="moon",
+		.timezone="right/UTC",
+		.time=-16751025,
+		.local_tm=		{
+			.tm_year=69,
+			.tm_mon=5,
+			.tm_mday=21,
+			.tm_hour=2,
+			.tm_min=56,
+			.tm_sec=15,
+			.tm_wday=6,
+			.tm_yday=171,
+			.tm_isdst=0,
+			.tm_gmtoff=0,
+			.tm_zone="UTC"
+		},
+		.gmt_tm=		{
+			.tm_year=69,
+			.tm_mon=5,
+			.tm_mday=21,
+			.tm_hour=2,
+			.tm_min=56,
+			.tm_sec=15,
+			.tm_wday=6,
+			.tm_yday=171,
+			.tm_isdst=0,
+			.tm_gmtoff=0,
+			.tm_zone="GMT"
+		},
+	},
+	{
+		.descr="moon",
+		.timezone="right/America/Edmonton",
+		.time=-16751025,
+		.local_tm=		{
+			.tm_year=69,
+			.tm_mon=5,
+			.tm_mday=20,
+			.tm_hour=19,
+			.tm_min=56,
+			.tm_sec=15,
+			.tm_wday=5,
+			.tm_yday=170,
+			.tm_isdst=0,
+			.tm_gmtoff=-25200,
+			.tm_zone="MST"
+		},
+		.gmt_tm=		{
+			.tm_year=69,
+			.tm_mon=5,
+			.tm_mday=21,
+			.tm_hour=2,
+			.tm_min=56,
+			.tm_sec=15,
+			.tm_wday=6,
+			.tm_yday=171,
+			.tm_isdst=0,
+			.tm_gmtoff=0,
+			.tm_zone="GMT"
+		},
+	},
+	{
+		.descr="epoch",
+		.timezone="posix/America/Edmonton",
+		.time=0,
+		.local_tm=		{
+			.tm_year=69,
+			.tm_mon=11,
+			.tm_mday=31,
+			.tm_hour=17,
+			.tm_min=0,
+			.tm_sec=0,
+			.tm_wday=3,
+			.tm_yday=364,
+			.tm_isdst=0,
+			.tm_gmtoff=-25200,
+			.tm_zone="MST"
+		},
+		.gmt_tm=		{
+			.tm_year=70,
+			.tm_mon=0,
+			.tm_mday=1,
+			.tm_hour=0,
+			.tm_min=0,
+			.tm_sec=0,
+			.tm_wday=4,
+			.tm_yday=0,
+			.tm_isdst=0,
+			.tm_gmtoff=0,
+			.tm_zone="GMT"
+		},
+	},
+	{
+		.descr="epoch",
+		.timezone="right/UTC",
+		.time=0,
+		.local_tm=		{
+			.tm_year=70,
+			.tm_mon=0,
+			.tm_mday=1,
+			.tm_hour=0,
+			.tm_min=0,
+			.tm_sec=0,
+			.tm_wday=4,
+			.tm_yday=0,
+			.tm_isdst=0,
+			.tm_gmtoff=0,
+			.tm_zone="UTC"
+		},
+		.gmt_tm=		{
+			.tm_year=70,
+			.tm_mon=0,
+			.tm_mday=1,
+			.tm_hour=0,
+			.tm_min=0,
+			.tm_sec=0,
+			.tm_wday=4,
+			.tm_yday=0,
+			.tm_isdst=0,
+			.tm_gmtoff=0,
+			.tm_zone="GMT"
+		},
+	},
+	{
+		.descr="epoch",
+		.timezone="right/America/Edmonton",
+		.time=0,
+		.local_tm=		{
+			.tm_year=69,
+			.tm_mon=11,
+			.tm_mday=31,
+			.tm_hour=17,
+			.tm_min=0,
+			.tm_sec=0,
+			.tm_wday=3,
+			.tm_yday=364,
+			.tm_isdst=0,
+			.tm_gmtoff=-25200,
+			.tm_zone="MST"
+		},
+		.gmt_tm=		{
+			.tm_year=70,
+			.tm_mon=0,
+			.tm_mday=1,
+			.tm_hour=0,
+			.tm_min=0,
+			.tm_sec=0,
+			.tm_wday=4,
+			.tm_yday=0,
+			.tm_isdst=0,
+			.tm_gmtoff=0,
+			.tm_zone="GMT"
+		},
+	},
+	{
+		.descr="epoch - 1",
+		.timezone="posix/America/Edmonton",
+		.time=-1,
+		.local_tm=		{
+			.tm_year=69,
+			.tm_mon=11,
+			.tm_mday=31,
+			.tm_hour=16,
+			.tm_min=59,
+			.tm_sec=59,
+			.tm_wday=3,
+			.tm_yday=364,
+			.tm_isdst=0,
+			.tm_gmtoff=-25200,
+			.tm_zone="MST"
+		},
+		.gmt_tm=		{
+			.tm_year=69,
+			.tm_mon=11,
+			.tm_mday=31,
+			.tm_hour=23,
+			.tm_min=59,
+			.tm_sec=59,
+			.tm_wday=3,
+			.tm_yday=364,
+			.tm_isdst=0,
+			.tm_gmtoff=0,
+			.tm_zone="GMT"
+		},
+	},
+	{
+		.descr="epoch - 1",
+		.timezone="right/UTC",
+		.time=-1,
+		.local_tm=		{
+			.tm_year=69,
+			.tm_mon=11,
+			.tm_mday=31,
+			.tm_hour=23,
+			.tm_min=59,
+			.tm_sec=59,
+			.tm_wday=3,
+			.tm_yday=364,
+			.tm_isdst=0,
+			.tm_gmtoff=0,
+			.tm_zone="UTC"
+		},
+		.gmt_tm=		{
+			.tm_year=69,
+			.tm_mon=11,
+			.tm_mday=31,
+			.tm_hour=23,
+			.tm_min=59,
+			.tm_sec=59,
+			.tm_wday=3,
+			.tm_yday=364,
+			.tm_isdst=0,
+			.tm_gmtoff=0,
+			.tm_zone="GMT"
+		},
+	},
+	{
+		.descr="epoch - 1",
+		.timezone="right/America/Edmonton",
+		.time=-1,
+		.local_tm=		{
+			.tm_year=69,
+			.tm_mon=11,
+			.tm_mday=31,
+			.tm_hour=16,
+			.tm_min=59,
+			.tm_sec=59,
+			.tm_wday=3,
+			.tm_yday=364,
+			.tm_isdst=0,
+			.tm_gmtoff=-25200,
+			.tm_zone="MST"
+		},
+		.gmt_tm=		{
+			.tm_year=69,
+			.tm_mon=11,
+			.tm_mday=31,
+			.tm_hour=23,
+			.tm_min=59,
+			.tm_sec=59,
+			.tm_wday=3,
+			.tm_yday=364,
+			.tm_isdst=0,
+			.tm_gmtoff=0,
+			.tm_zone="GMT"
+		},
+	},
+	{
+		.descr="legacy min",
+		.timezone="posix/America/Edmonton",
+		.time=-2147483648,
+		.local_tm=		{
+			.tm_year=1,
+			.tm_mon=11,
+			.tm_mday=13,
+			.tm_hour=13,
+			.tm_min=12,
+			.tm_sec=0,
+			.tm_wday=5,
+			.tm_yday=346,
+			.tm_isdst=0,
+			.tm_gmtoff=-27232,
+			.tm_zone="LMT"
+		},
+		.gmt_tm=		{
+			.tm_year=1,
+			.tm_mon=11,
+			.tm_mday=13,
+			.tm_hour=20,
+			.tm_min=45,
+			.tm_sec=52,
+			.tm_wday=5,
+			.tm_yday=346,
+			.tm_isdst=0,
+			.tm_gmtoff=0,
+			.tm_zone="GMT"
+		},
+	},
+	{
+		.descr="legacy min",
+		.timezone="right/UTC",
+		.time=-2147483648,
+		.local_tm=		{
+			.tm_year=1,
+			.tm_mon=11,
+			.tm_mday=13,
+			.tm_hour=20,
+			.tm_min=45,
+			.tm_sec=52,
+			.tm_wday=5,
+			.tm_yday=346,
+			.tm_isdst=0,
+			.tm_gmtoff=0,
+			.tm_zone="UTC"
+		},
+		.gmt_tm=		{
+			.tm_year=1,
+			.tm_mon=11,
+			.tm_mday=13,
+			.tm_hour=20,
+			.tm_min=45,
+			.tm_sec=52,
+			.tm_wday=5,
+			.tm_yday=346,
+			.tm_isdst=0,
+			.tm_gmtoff=0,
+			.tm_zone="GMT"
+		},
+	},
+	{
+		.descr="legacy min - 1",
+		.timezone="posix/America/Edmonton",
+		.time=-2147483649,
+		.local_tm=		{
+			.tm_year=1,
+			.tm_mon=11,
+			.tm_mday=13,
+			.tm_hour=13,
+			.tm_min=11,
+			.tm_sec=59,
+			.tm_wday=5,
+			.tm_yday=346,
+			.tm_isdst=0,
+			.tm_gmtoff=-27232,
+			.tm_zone="LMT"
+		},
+		.gmt_tm=		{
+			.tm_year=1,
+			.tm_mon=11,
+			.tm_mday=13,
+			.tm_hour=20,
+			.tm_min=45,
+			.tm_sec=51,
+			.tm_wday=5,
+			.tm_yday=346,
+			.tm_isdst=0,
+			.tm_gmtoff=0,
+			.tm_zone="GMT"
+		},
+	},
+	{
+		.descr="legacy min - 1",
+		.timezone="right/UTC",
+		.time=-2147483649,
+		.local_tm=		{
+			.tm_year=1,
+			.tm_mon=11,
+			.tm_mday=13,
+			.tm_hour=20,
+			.tm_min=45,
+			.tm_sec=51,
+			.tm_wday=5,
+			.tm_yday=346,
+			.tm_isdst=0,
+			.tm_gmtoff=0,
+			.tm_zone="UTC"
+		},
+		.gmt_tm=		{
+			.tm_year=1,
+			.tm_mon=11,
+			.tm_mday=13,
+			.tm_hour=20,
+			.tm_min=45,
+			.tm_sec=51,
+			.tm_wday=5,
+			.tm_yday=346,
+			.tm_isdst=0,
+			.tm_gmtoff=0,
+			.tm_zone="GMT"
+		},
+	},
+	{
+		.descr="legacy max",
+		.timezone="posix/America/Edmonton",
+		.time=2147483647,
+		.local_tm=		{
+			.tm_year=138,
+			.tm_mon=0,
+			.tm_mday=18,
+			.tm_hour=20,
+			.tm_min=14,
+			.tm_sec=7,
+			.tm_wday=1,
+			.tm_yday=17,
+			.tm_isdst=0,
+			.tm_gmtoff=-25200,
+			.tm_zone="MST"
+		},
+		.gmt_tm=		{
+			.tm_year=138,
+			.tm_mon=0,
+			.tm_mday=19,
+			.tm_hour=3,
+			.tm_min=14,
+			.tm_sec=7,
+			.tm_wday=2,
+			.tm_yday=18,
+			.tm_isdst=0,
+			.tm_gmtoff=0,
+			.tm_zone="GMT"
+		},
+	},
+	{
+		.descr="legacy max",
+		.timezone="right/UTC",
+		.time=2147483647,
+		.local_tm=		{
+			.tm_year=138,
+			.tm_mon=0,
+			.tm_mday=19,
+			.tm_hour=3,
+			.tm_min=13,
+			.tm_sec=40,
+			.tm_wday=2,
+			.tm_yday=18,
+			.tm_isdst=0,
+			.tm_gmtoff=0,
+			.tm_zone="UTC"
+		},
+		.gmt_tm=		{
+			.tm_year=138,
+			.tm_mon=0,
+			.tm_mday=19,
+			.tm_hour=3,
+			.tm_min=14,
+			.tm_sec=7,
+			.tm_wday=2,
+			.tm_yday=18,
+			.tm_isdst=0,
+			.tm_gmtoff=0,
+			.tm_zone="GMT"
+		},
+	},
+	{
+		.descr="legacy max + 1",
+		.timezone="posix/America/Edmonton",
+		.time=2147483648,
+		.local_tm=		{
+			.tm_year=138,
+			.tm_mon=0,
+			.tm_mday=18,
+			.tm_hour=20,
+			.tm_min=14,
+			.tm_sec=8,
+			.tm_wday=1,
+			.tm_yday=17,
+			.tm_isdst=0,
+			.tm_gmtoff=-25200,
+			.tm_zone="MST"
+		},
+		.gmt_tm=		{
+			.tm_year=138,
+			.tm_mon=0,
+			.tm_mday=19,
+			.tm_hour=3,
+			.tm_min=14,
+			.tm_sec=8,
+			.tm_wday=2,
+			.tm_yday=18,
+			.tm_isdst=0,
+			.tm_gmtoff=0,
+			.tm_zone="GMT"
+		},
+	},
+	{
+		.descr="legacy max + 1",
+		.timezone="right/UTC",
+		.time=2147483648,
+		.local_tm=		{
+			.tm_year=138,
+			.tm_mon=0,
+			.tm_mday=19,
+			.tm_hour=3,
+			.tm_min=13,
+			.tm_sec=41,
+			.tm_wday=2,
+			.tm_yday=18,
+			.tm_isdst=0,
+			.tm_gmtoff=0,
+			.tm_zone="UTC"
+		},
+		.gmt_tm=		{
+			.tm_year=138,
+			.tm_mon=0,
+			.tm_mday=19,
+			.tm_hour=3,
+			.tm_min=14,
+			.tm_sec=8,
+			.tm_wday=2,
+			.tm_yday=18,
+			.tm_isdst=0,
+			.tm_gmtoff=0,
+			.tm_zone="GMT"
+		},
+	},
+	{
+		.descr="min",
+		.timezone="posix/America/Edmonton",
+		.time=INT64_MIN,
+		.local_tm=		{
+			.tm_year=0,
+			.tm_mon=0,
+			.tm_mday=0,
+			.tm_hour=0,
+			.tm_min=0,
+			.tm_sec=0,
+			.tm_wday=0,
+			.tm_yday=0,
+			.tm_isdst=0,
+			.tm_gmtoff=0,
+			.tm_zone="FAILURE"
+		},
+		.gmt_tm=		{
+			.tm_year=0,
+			.tm_mon=0,
+			.tm_mday=0,
+			.tm_hour=0,
+			.tm_min=0,
+			.tm_sec=0,
+			.tm_wday=0,
+			.tm_yday=0,
+			.tm_isdst=0,
+			.tm_gmtoff=0,
+			.tm_zone="FAILURE"
+		},
+	},
+	{
+		.descr="min",
+		.timezone="right/UTC",
+		.time=INT64_MIN,
+		.local_tm=		{
+			.tm_year=0,
+			.tm_mon=0,
+			.tm_mday=0,
+			.tm_hour=0,
+			.tm_min=0,
+			.tm_sec=0,
+			.tm_wday=0,
+			.tm_yday=0,
+			.tm_isdst=0,
+			.tm_gmtoff=0,
+			.tm_zone="FAILURE"
+		},
+		.gmt_tm=		{
+			.tm_year=0,
+			.tm_mon=0,
+			.tm_mday=0,
+			.tm_hour=0,
+			.tm_min=0,
+			.tm_sec=0,
+			.tm_wday=0,
+			.tm_yday=0,
+			.tm_isdst=0,
+			.tm_gmtoff=0,
+			.tm_zone="FAILURE"
+		},
+	},
+	{
+		.descr="max",
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+		.descr="transition standard to daylight - 1",
+		.timezone="right/America/Edmonton",
+		.time=1457859625,
+		.local_tm=		{
+			.tm_year=116,
+			.tm_mon=2,
+			.tm_mday=13,
+			.tm_hour=1,
+			.tm_min=59,
+			.tm_sec=59,
+			.tm_wday=0,
+			.tm_yday=72,
+			.tm_isdst=0,
+			.tm_gmtoff=-25200,
+			.tm_zone="MST"
+		},
+		.gmt_tm=		{
+			.tm_year=116,
+			.tm_mon=2,
+			.tm_mday=13,
+			.tm_hour=9,
+			.tm_min=0,
+			.tm_sec=25,
+			.tm_wday=0,
+			.tm_yday=72,
+			.tm_isdst=0,
+			.tm_gmtoff=0,
+			.tm_zone="GMT"
+		},
+	},
+	{
+		.descr="transition standard to daylight",
+		.timezone="right/America/Edmonton",
+		.time=1457859626,
+		.local_tm=		{
+			.tm_year=116,
+			.tm_mon=2,
+			.tm_mday=13,
+			.tm_hour=3,
+			.tm_min=0,
+			.tm_sec=0,
+			.tm_wday=0,
+			.tm_yday=72,
+			.tm_isdst=1,
+			.tm_gmtoff=-21600,
+			.tm_zone="MDT"
+		},
+		.gmt_tm=		{
+			.tm_year=116,
+			.tm_mon=2,
+			.tm_mday=13,
+			.tm_hour=9,
+			.tm_min=0,
+			.tm_sec=26,
+			.tm_wday=0,
+			.tm_yday=72,
+			.tm_isdst=0,
+			.tm_gmtoff=0,
+			.tm_zone="GMT"
+		},
+	},
+	{
+		.descr="transition standard to daylight + 1",
+		.timezone="right/America/Edmonton",
+		.time=1457859627,
+		.local_tm=		{
+			.tm_year=116,
+			.tm_mon=2,
+			.tm_mday=13,
+			.tm_hour=3,
+			.tm_min=0,
+			.tm_sec=1,
+			.tm_wday=0,
+			.tm_yday=72,
+			.tm_isdst=1,
+			.tm_gmtoff=-21600,
+			.tm_zone="MDT"
+		},
+		.gmt_tm=		{
+			.tm_year=116,
+			.tm_mon=2,
+			.tm_mday=13,
+			.tm_hour=9,
+			.tm_min=0,
+			.tm_sec=27,
+			.tm_wday=0,
+			.tm_yday=72,
+			.tm_isdst=0,
+			.tm_gmtoff=0,
+			.tm_zone="GMT"
+		},
+	},
+	{
+		.descr="transition daylight to standard - 1",
+		.timezone="posix/America/Edmonton",
+		.time=1478419199,
+		.local_tm=		{
+			.tm_year=116,
+			.tm_mon=10,
+			.tm_mday=6,
+			.tm_hour=1,
+			.tm_min=59,
+			.tm_sec=59,
+			.tm_wday=0,
+			.tm_yday=310,
+			.tm_isdst=1,
+			.tm_gmtoff=-21600,
+			.tm_zone="MDT"
+		},
+		.gmt_tm=		{
+			.tm_year=116,
+			.tm_mon=10,
+			.tm_mday=6,
+			.tm_hour=7,
+			.tm_min=59,
+			.tm_sec=59,
+			.tm_wday=0,
+			.tm_yday=310,
+			.tm_isdst=0,
+			.tm_gmtoff=0,
+			.tm_zone="GMT"
+		},
+	},
+	{
+		.descr="transition daylight to standard",
+		.timezone="posix/America/Edmonton",
+		.time=1478419200,
+		.local_tm=		{
+			.tm_year=116,
+			.tm_mon=10,
+			.tm_mday=6,
+			.tm_hour=1,
+			.tm_min=0,
+			.tm_sec=0,
+			.tm_wday=0,
+			.tm_yday=310,
+			.tm_isdst=0,
+			.tm_gmtoff=-25200,
+			.tm_zone="MST"
+		},
+		.gmt_tm=		{
+			.tm_year=116,
+			.tm_mon=10,
+			.tm_mday=6,
+			.tm_hour=8,
+			.tm_min=0,
+			.tm_sec=0,
+			.tm_wday=0,
+			.tm_yday=310,
+			.tm_isdst=0,
+			.tm_gmtoff=0,
+			.tm_zone="GMT"
+		},
+	},
+	{
+		.descr="transition daylight to standard + 1",
+		.timezone="posix/America/Edmonton",
+		.time=1478419201,
+		.local_tm=		{
+			.tm_year=116,
+			.tm_mon=10,
+			.tm_mday=6,
+			.tm_hour=1,
+			.tm_min=0,
+			.tm_sec=1,
+			.tm_wday=0,
+			.tm_yday=310,
+			.tm_isdst=0,
+			.tm_gmtoff=-25200,
+			.tm_zone="MST"
+		},
+		.gmt_tm=		{
+			.tm_year=116,
+			.tm_mon=10,
+			.tm_mday=6,
+			.tm_hour=8,
+			.tm_min=0,
+			.tm_sec=1,
+			.tm_wday=0,
+			.tm_yday=310,
+			.tm_isdst=0,
+			.tm_gmtoff=0,
+			.tm_zone="GMT"
+		},
+	},
+	{
+		.descr="transition daylight to standard - 1",
+		.timezone="right/America/Edmonton",
+		.time=1478419225,
+		.local_tm=		{
+			.tm_year=116,
+			.tm_mon=10,
+			.tm_mday=6,
+			.tm_hour=1,
+			.tm_min=59,
+			.tm_sec=59,
+			.tm_wday=0,
+			.tm_yday=310,
+			.tm_isdst=1,
+			.tm_gmtoff=-21600,
+			.tm_zone="MDT"
+		},
+		.gmt_tm=		{
+			.tm_year=116,
+			.tm_mon=10,
+			.tm_mday=6,
+			.tm_hour=8,
+			.tm_min=0,
+			.tm_sec=25,
+			.tm_wday=0,
+			.tm_yday=310,
+			.tm_isdst=0,
+			.tm_gmtoff=0,
+			.tm_zone="GMT"
+		},
+	},
+	{
+		.descr="transition daylight to standard",
+		.timezone="right/America/Edmonton",
+		.time=1478419226,
+		.local_tm=		{
+			.tm_year=116,
+			.tm_mon=10,
+			.tm_mday=6,
+			.tm_hour=1,
+			.tm_min=0,
+			.tm_sec=0,
+			.tm_wday=0,
+			.tm_yday=310,
+			.tm_isdst=0,
+			.tm_gmtoff=-25200,
+			.tm_zone="MST"
+		},
+		.gmt_tm=		{
+			.tm_year=116,
+			.tm_mon=10,
+			.tm_mday=6,
+			.tm_hour=8,
+			.tm_min=0,
+			.tm_sec=26,
+			.tm_wday=0,
+			.tm_yday=310,
+			.tm_isdst=0,
+			.tm_gmtoff=0,
+			.tm_zone="GMT"
+		},
+	},
+	{
+		.descr="transition daylight to standard + 1",
+		.timezone="right/America/Edmonton",
+		.time=1478419227,
+		.local_tm=		{
+			.tm_year=116,
+			.tm_mon=10,
+			.tm_mday=6,
+			.tm_hour=1,
+			.tm_min=0,
+			.tm_sec=1,
+			.tm_wday=0,
+			.tm_yday=310,
+			.tm_isdst=0,
+			.tm_gmtoff=-25200,
+			.tm_zone="MST"
+		},
+		.gmt_tm=		{
+			.tm_year=116,
+			.tm_mon=10,
+			.tm_mday=6,
+			.tm_hour=8,
+			.tm_min=0,
+			.tm_sec=27,
+			.tm_wday=0,
+			.tm_yday=310,
+			.tm_isdst=0,
+			.tm_gmtoff=0,
+			.tm_zone="GMT"
+		},
+	},
+        {
+		.descr = NULL,
+	},
+};
+
+void printtm(FILE *f, struct tm *tm)
+{
+	fprintf(f, "\t\t{\n\t\t\t.tm_year=%d,\n\t\t\t.tm_mon=%d,\n\t\t\t"
+	    ".tm_mday=%d,\n\t\t\t.tm_hour=%d,\n\t\t\t.tm_min=%d,\n\t\t\t"
+	    ".tm_sec=%d,\n\t\t\t.tm_wday=%d,\n\t\t\t.tm_yday=%d,\n\t\t\t"
+	    ".tm_isdst=%d,\n\t\t\t.tm_gmtoff=%ld,\n\t\t\t.tm_zone=\"%s\""
+	    "\n\t\t},\n",
+	    tm->tm_year,
+	    tm->tm_mon,
+	    tm->tm_mday,
+	    tm->tm_hour,
+	    tm->tm_min,
+	    tm->tm_sec,
+	    tm->tm_wday,
+	    tm->tm_yday,
+	    tm->tm_isdst,
+	    tm->tm_gmtoff,
+	    tm->tm_zone);
+}
+
+int dotimetest(struct timetest *test, int print)
+{
+	int failures = 0;
+	struct tm local = {}, gmt = {};
+	time_t converted;
+	if (gmtime_r(&test->time, &gmt) == NULL) {
+		memset(&gmt, 0, sizeof(gmt));
+		gmt.tm_zone="FAILURE";
+	} else {
+		converted = timegm(&gmt);
+		if (converted != test->time) {
+			fprintf(stderr, "FAIL: test \"%s\", tz \"%s\" timegm "
+			    "does not match expected value\n", test->descr,
+			    test->timezone);
+			fprintf(stderr, "expected: %lld\n", test->time);
+			fprintf(stderr, "actual: %lld\n", converted);
+			failures++;
+		}
+	}
+	if (!tm_match(&test->gmt_tm, &gmt)) {
+		fprintf(stderr, "FAIL: test \"%s\", tz \"%s\" gmtime_r does not"
+		    " match expected value\n", test->descr, test->timezone);
+		fprintf(stderr, "expected: ");
+		printtm(stderr, &test->gmt_tm);
+		fprintf(stderr, "actual: ");
+		printtm(stderr, &gmt);
+		failures++;
+	}
+	setenv("TZ", test->timezone, 1);
+	if (localtime_r(&test->time, &local) == NULL) {
+		memset(&local, 0, sizeof(local));
+		local.tm_zone="FAILURE";
+	} else {
+		converted = mktime(&local);
+		if (converted != test->time) {
+			fprintf(stderr, "FAIL: test \"%s\", tz \"%s\" mktime "
+			    "does not match expected value\n", test->descr,
+			    test->timezone);
+			fprintf(stderr, "expected: %lld\n", test->time);
+			fprintf(stderr, "actual: %lld\n", converted);
+			failures++;
+		}
+	}
+	if (!tm_match(&test->local_tm, &local)) {
+		fprintf(stderr, "FAIL: test \"%s\", tz \"%s\" localtime_r does "
+		    "not match expected value\n", test->descr, test->timezone);
+		fprintf(stderr, "expected: ");
+		printtm(stderr, &test->local_tm);
+		fprintf(stderr, "actual: ");
+		printtm(stderr, &local);
+		failures++;
+	}
+	if (print) {
+		printf("\t{\n\t\t.descr=\"%s\",\n\t\t.timezone=\"%s\",\n\t\t"
+		    ".time=%lld,\n", test->descr, test->timezone, test->time);
+		printf("\t\t.local_tm=");
+		printtm(stdout, &local);
+		printf("\t\t.gmt_tm=");
+		printtm(stdout, &gmt);
+		printf("\t},\n");
+	}
+	return failures;
+}
+
+
+void printtmdescr(FILE *f, struct tm *tm, char * descr)
+{
+	fprintf(f, "%s: ", descr);
+	printtm(f, tm);
+}
+
+int main() {
+	int failures = 0;
+	int verbose = 0;
+	struct stat sb;
+
+	if (stat("/usr/share/zoneinfo/posix", &sb) == -1) {
+		fprintf(stderr, "WARNING: /usr/share/zoneinfo/posix not"
+		    "present,\nCreate posix time zones to run this test.\n");
+		exit(0);
+	}
+	if (stat("/usr/share/zoneinfo/right", &sb) == -1) {
+		fprintf(stderr, "WARNING: /usr/share/zoneinfo/right not"
+		    "present,\nCreate right time zones to run this test.\n");
+		exit(0);
+	}
+
+	for (size_t i = 0; timetests[i].descr != NULL; i++) {
+		failures += dotimetest(&timetests[i], verbose);
+	}
+	if (failures)
+		fprintf(stderr, "FAIL:  %d time test failures\n", failures);
+	else
+		printf("SUCCESS: no time test failures\n");
+	exit(failures);
+}
+