parsedate: fix date parsing for systems with 32 bit long

Make curl_getdate() handle dates before 1970 as well (returning negative
values).

Make test 517 test dates for 64 bit time_t.

This fixes bug (3) mentioned in #2238

Closes #2250

6 files changed, 226 insertions, 239 deletions

diff --git a/configure.ac b/configure.ac
index c223a0436..76fa93d1b 100755
--- a/configure.ac
+++ b/configure.ac
@@ -5,7 +5,7 @@
 #                            | (__| |_| |  _ <| |___
 #                             \___|\___/|_| \_\_____|
 #
-# Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
+# Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
 #
 # This software is licensed as described in the file COPYING, which
 # you should have received as part of this distribution. The terms
@@ -3483,6 +3483,23 @@ AC_CHECK_TYPE([bool],[
 #endif
 ])
 
+AC_MSG_CHECKING([if time_t is unsigned])
+AC_RUN_IFELSE([
+  AC_LANG_SOURCE([[
+  #include <time.h>
+  #include <limits.h>
+  time_t t = ULONG_MAX;
+  return (t > 0);
+  ]])] ,[
+  AC_MSG_RESULT([yes])
+  AC_DEFINE(HAVE_TIME_T_UNSIGNED, 1, [Define this if time_t is unsigned])
+],[
+  AC_MSG_RESULT([no])
+],[
+  dnl cross-compiling, most systems are unsigned
+  AC_MSG_RESULT([no])
+])
+
 CURL_CONFIGURE_CURL_SOCKLEN_T
 
 CURL_CONFIGURE_PULL_SYS_POLL
diff --git a/docs/libcurl/curl_getdate.3 b/docs/libcurl/curl_getdate.3
index d09980d09..71479d20e 100644
--- a/docs/libcurl/curl_getdate.3
+++ b/docs/libcurl/curl_getdate.3
@@ -5,7 +5,7 @@
 .\" *                            | (__| |_| |  _ <| |___
 .\" *                             \___|\___/|_| \_\_____|
 .\" *
-.\" * Copyright (C) 1998 - 2015, Daniel Stenberg, <daniel@haxx.se>, et al.
+.\" * Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
 .\" *
 .\" * This software is licensed as described in the file COPYING, which
 .\" * you should have received as part of this distribution. The terms
@@ -96,13 +96,15 @@ only ones RFC 7231 says HTTP applications may use.
 This function returns -1 when it fails to parse the date string. Otherwise it
 returns the number of seconds as described.
 
-If the year is larger than 2037 on systems with 32 bit time_t, this function
-will return 0x7fffffff (since that is the largest possible signed 32 bit
-number).
+On systems with a signed 32 bit time_t: if the year is larger than 2037 or
+less than 1903, this function will return -1.
 
-Having a 64 bit time_t is not a guarantee that dates beyond 03:14:07 UTC,
-January 19, 2038 will work fine. On systems with a 64 bit time_t but with a
-crippled mktime(), \fIcurl_getdate(3)\fP will return -1 in this case.
+On systems with an unsigned 32 bit time_t: if the year is larger than 2106 or
+less than 1970, this function will return -1.
+
+On systems with 64 bit time_t: if the year is less than 1583, this function
+will return -1. (The Gregorian calendar was first introduced 1582 so no "real"
+dates in this way of doing dates existed before then.)
 .SH "SEE ALSO"
 .BR curl_easy_escape "(3), " curl_easy_unescape "(3), "
 .BR CURLOPT_TIMECONDITION "(3), " CURLOPT_TIMEVALUE "(3) "
diff --git a/lib/curl_setup.h b/lib/curl_setup.h
index e5a657934..100b8d40f 100644
--- a/lib/curl_setup.h
+++ b/lib/curl_setup.h
@@ -424,6 +424,24 @@
 #endif
 #define CURL_OFF_T_MIN (-CURL_OFF_T_MAX - CURL_OFF_T_C(1))
 
+#if (SIZEOF_TIME_T == 4)
+#  ifdef HAVE_TIME_T_UNSIGNED
+#  define TIME_T_MAX UINT_MAX
+#  define TIME_T_MIN 0
+#  else
+#  define TIME_T_MAX INT_MAX
+#  define TIME_T_MIN INT_MIN
+#  endif
+#else
+#  ifdef HAVE_TIME_T_UNSIGNED
+#  define TIME_T_MAX 0xFFFFFFFFFFFFFFFF
+#  define TIME_T_MIN 0
+#  else
+#  define TIME_T_MAX 0x7FFFFFFFFFFFFFFF
+#  define TIME_T_MIN -0x10000000000000000
+#  endif
+#endif
+
 /*
  * Arg 2 type for gethostname in case it hasn't been defined in config file.
  */
diff --git a/lib/parsedate.c b/lib/parsedate.c
index 0fabbd269..0dbaf3610 100644
--- a/lib/parsedate.c
+++ b/lib/parsedate.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -276,26 +276,23 @@ struct my_tm {
   int tm_hour;
   int tm_mday;
   int tm_mon;
-  int tm_year;
+  int tm_year; /* full year */
 };
 
 /* struct tm to time since epoch in GMT time zone.
  * This is similar to the standard mktime function but for GMT only, and
  * doesn't suffer from the various bugs and portability problems that
  * some systems' implementations have.
+ *
+ * Returns 0 on success, otherwise non-zero.
  */
-static time_t my_timegm(struct my_tm *tm)
+static void my_timegm(struct my_tm *tm, time_t *t)
 {
   static const int month_days_cumulative [12] =
     { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 };
   int month, year, leap_days;
 
-  if(tm->tm_year < 70)
-    /* we don't support years before 1970 as they will cause this function
-       to return a negative value */
-    return -1;
-
-  year = tm->tm_year + 1900;
+  year = tm->tm_year;
   month = tm->tm_mon;
   if(month < 0) {
     year += (11 - month) / 12;
@@ -310,9 +307,9 @@ static time_t my_timegm(struct my_tm *tm)
   leap_days = ((leap_days / 4) - (leap_days / 100) + (leap_days / 400)
                - (1969 / 4) + (1969 / 100) - (1969 / 400));
 
-  return ((((time_t) (year - 1970) * 365
-            + leap_days + month_days_cumulative [month] + tm->tm_mday - 1) * 24
-           + tm->tm_hour) * 60 + tm->tm_min) * 60 + tm->tm_sec;
+  *t = ((((time_t) (year - 1970) * 365
+          + leap_days + month_days_cumulative[month] + tm->tm_mday - 1) * 24
+         + tm->tm_hour) * 60 + tm->tm_min) * 60 + tm->tm_sec;
 }
 
 /*
@@ -462,7 +459,7 @@ static int parsedate(const char *date, time_t *output)
         if(!found && (dignext == DATE_YEAR) && (yearnum == -1)) {
           yearnum = val;
           found = TRUE;
-          if(yearnum < 1900) {
+          if(yearnum < 100) {
             if(yearnum > 70)
               yearnum += 1900;
             else
@@ -491,18 +488,39 @@ static int parsedate(const char *date, time_t *output)
     /* lacks vital info, fail */
     return PARSEDATE_FAIL;
 
-#if SIZEOF_TIME_T < 5
-  /* 32 bit time_t can only hold dates to the beginning of 2038 */
-  if(yearnum > 2037) {
-    *output = 0x7fffffff;
-    return PARSEDATE_LATER;
+#ifdef HAVE_TIME_T_UNSIGNED
+  if(yearnum < 1970) {
+    /* only positive numbers cannot return earlier */
+    *output = TIME_T_MIN;
+    return PARSEDATE_SOONER;
   }
 #endif
 
-  if(yearnum < 1970) {
-    *output = 0;
+#if (SIZEOF_TIME_T < 5)
+
+#if HAVE_TIME_T_UNSIGNED
+  /* an unsigned 32 bit time_t can only hold dates to 2106 */
+  if(yearnum > 2105) {
+    *output = TIME_T_MAX;
+    return PARSEDATE_LATER;
+  }
+#else
+  /* a signed 32 bit time_t can only hold dates to the beginning of 2038 */
+  if(yearnum > 2037) {
+    *output = TIME_T_MAX;
+    return PARSEDATE_LATER;
+  }
+  if(yearnum < 1903) {
+    *output = TIME_T_MIN;
     return PARSEDATE_SOONER;
   }
+#endif
+
+#else
+  /* The Gregorian calendar was introduced 1582 */
+  if(yearnum < 1583)
+    return PARSEDATE_FAIL;
+#endif
 
   if((mdaynum > 31) || (monnum > 11) ||
      (hournum > 23) || (minnum > 59) || (secnum > 60))
@@ -513,31 +531,25 @@ static int parsedate(const char *date, time_t *output)
   tm.tm_hour = hournum;
   tm.tm_mday = mdaynum;
   tm.tm_mon = monnum;
-  tm.tm_year = yearnum - 1900;
-
-  /* my_timegm() returns a time_t. time_t is often 32 bits, even on many
-     architectures that feature 64 bit 'long'.
+  tm.tm_year = yearnum;
 
-     Some systems have 64 bit time_t and deal with years beyond 2038. However,
-     even on some of the systems with 64 bit time_t mktime() returns -1 for
-     dates beyond 03:14:07 UTC, January 19, 2038. (Such as AIX 5100-06)
+  /* my_timegm() returns a time_t. time_t is often 32 bits, sometimes even on
+     architectures that feature 64 bit 'long' but ultimately time_t is the
+     correct data type to use.
   */
-  t = my_timegm(&tm);
-
-  /* time zone adjust (cast t to int to compare to negative one) */
-  if(-1 != (int)t) {
+  my_timegm(&tm, &t);
 
-    /* Add the time zone diff between local time zone and GMT. */
-    long delta = (long)(tzoff!=-1?tzoff:0);
+  /* Add the time zone diff between local time zone and GMT. */
+  if(tzoff == -1)
+    tzoff = 0;
 
-    if((delta>0) && (t > LONG_MAX - delta)) {
-      *output = 0x7fffffff;
-      return PARSEDATE_LATER; /* time_t overflow */
-    }
-
-    t += delta;
+  if((tzoff > 0) && (t > TIME_T_MAX - tzoff)) {
+    *output = TIME_T_MAX;
+    return PARSEDATE_LATER; /* time_t overflow */
   }
 
+  t += tzoff;
+
   *output = t;
 
   return PARSEDATE_OK;
@@ -551,6 +563,10 @@ time_t curl_getdate(const char *p, const time_t *now)
 
   switch(rc) {
   case PARSEDATE_OK:
+    if(parsed == -1)
+      /* avoid returning -1 for a working scenario */
+      parsed++;
+    /* fallthrough */
   case PARSEDATE_LATER:
   case PARSEDATE_SOONER:
     return parsed;
diff --git a/tests/data/test517 b/tests/data/test517
index 513634f15..f58f4edaa 100644
--- a/tests/data/test517
+++ b/tests/data/test517
@@ -32,96 +32,6 @@ nothing
 # Verify data after the test has been "shot"
 <verify>
 <stdout>
-0: Sun, 06 Nov 1994 08:49:37 GMT => 784111777
-1: Sunday, 06-Nov-94 08:49:37 GMT => 784111777
-2: Sun Nov  6 08:49:37 1994 => 784111777
-3: 06 Nov 1994 08:49:37 GMT => 784111777
-4: 06-Nov-94 08:49:37 GMT => 784111777
-5: Nov  6 08:49:37 1994 => 784111777
-6: 06 Nov 1994 08:49:37 => 784111777
-7: 06-Nov-94 08:49:37 => 784111777
-8: 1994 Nov 6 08:49:37 => 784111777
-9: GMT 08:49:37 06-Nov-94 Sunday => 784111777
-10: 94 6 Nov 08:49:37 => 784111777
-11: 1994 Nov 6 => 784080000
-12: 06-Nov-94 => 784080000
-13: Sun Nov 6 94 => 784080000
-14: 1994.Nov.6 => 784080000
-15: Sun/Nov/6/94/GMT => 784080000
-16: Sun, 06 Nov 1994 08:49:37 CET => 784108177
-17: 06 Nov 1994 08:49:37 EST => 784129777
-18: Sun, 12 Sep 2004 15:05:58 -0700 => 1095026758
-19: Sat, 11 Sep 2004 21:32:11 +0200 => 1094931131
-20: 20040912 15:05:58 -0700 => 1095026758
-21: 20040911 +0200 => 1094853600
-22: Thu, 01-Jan-1970 00:59:59 GMT => 3599
-23: Thu, 01-Jan-1970 01:00:00 GMT => 3600
-24: Sat, 15-Apr-17 21:01:22 GMT => 1492290082
-25: Thu, 19-Apr-2007 16:00:00 GMT => 1176998400
-26: Wed, 25 Apr 2007 21:02:13 GMT => 1177534933
-27: Thu, 19/Apr\2007 16:00:00 GMT => 1176998400
-28: Fri, 1 Jan 2010 01:01:50 GMT => 1262307710
-29: Wednesday, 1-Jan-2003 00:00:00 GMT => 1041379200
-30: , 1-Jan-2003 00:00:00 GMT => 1041379200
-31:  1-Jan-2003 00:00:00 GMT => 1041379200
-32: 1-Jan-2003 00:00:00 GMT => 1041379200
-33: Wed,18-Apr-07 22:50:12 GMT => 1176936612
-34: WillyWonka  , 18-Apr-07 22:50:12 GMT => -1
-35: WillyWonka  , 18-Apr-07 22:50:12 => -1
-36: WillyWonka  ,  18-apr-07   22:50:12 => -1
-37: Mon, 18-Apr-1977 22:50:13 GMT => 230251813
-38: Mon, 18-Apr-77 22:50:13 GMT => 230251813
-39: "Sat, 15-Apr-17\"21:01:22\"GMT" => 1492290082
-40: Partyday, 18- April-07 22:50:12 => -1
-41: Partyday, 18 - Apri-07 22:50:12 => -1
-42: Wednes, 1-Januar-2003 00:00:00 GMT => -1
-43: Sat, 15-Apr-17 21:01:22 => 1492290082
-44: Sat, 15-Apr-17 21:01:22 GMT-2 => 1492290082
-45: Sat, 15-Apr-17 21:01:22 GMT BLAH => 1492290082
-46: Sat, 15-Apr-17 21:01:22 GMT-0400 => 1492290082
-47: Sat, 15-Apr-17 21:01:22 GMT-0400 (EDT) => 1492290082
-48: Sat, 15-Apr-17 21:01:22 DST => -1
-49: Sat, 15-Apr-17 21:01:22 -0400 => 1492304482
-50: Sat, 15-Apr-17 21:01:22 (hello there) => -1
-51: Sat, 15-Apr-17 21:01:22 11:22:33 => -1
-52: Sat, 15-Apr-17 ::00 21:01:22 => -1
-53: Sat, 15-Apr-17 boink:z 21:01:22 => -1
-54: Sat, 15-Apr-17 91:22:33 21:01:22 => -1
-55: Thu Apr 18 22:50:12 2007 GMT => 1176936612
-56: 22:50:12 Thu Apr 18 2007 GMT => 1176936612
-57: Thu 22:50:12 Apr 18 2007 GMT => 1176936612
-58: Thu Apr 22:50:12 18 2007 GMT => 1176936612
-59: Thu Apr 18 22:50:12 2007 GMT => 1176936612
-60: Thu Apr 18 2007 22:50:12 GMT => 1176936612
-61: Thu Apr 18 2007 GMT 22:50:12 => 1176936612
-62: Sat, 15-Apr-17 21:01:22 GMT => 1492290082
-63: 15-Sat, Apr-17 21:01:22 GMT => 1492290082
-64: 15-Sat, Apr 21:01:22 GMT 17 => 1492290082
-65: 15-Sat, Apr 21:01:22 GMT 2017 => 1492290082
-66: 15 Apr 21:01:22 2017 => 1492290082
-67: 15 17 Apr 21:01:22 => 1492290082
-68: Apr 15 17 21:01:22 => 1492290082
-69: Apr 15 21:01:22 17 => 1492290082
-70: 2017 April 15 21:01:22 => -1
-71: 15 April 2017 21:01:22 => -1
-72: 98 April 17 21:01:22 => -1
-73: Thu, 012-Aug-2008 20:49:07 GMT => 1218574147
-74: Thu, 999999999999-Aug-2007 20:49:07 GMT => -1
-75: Thu, 12-Aug-2007 20:61:99999999999 GMT => -1
-76: IAintNoDateFool => -1
-77: Thu Apr 18 22:50 2007 GMT => 1176936600
-78: 20110623 12:34:56 => 1308832496
-79: 20110632 12:34:56 => -1
-80: 20110623 56:34:56 => -1
-81: 20111323 12:34:56 => -1
-82: 20110623 12:34:79 => -1
-83: Wed, 31 Dec 2008 23:59:60 GMT => 1230768000
-84: 20110623 12:3 => 1308830580
-85: 20110623 1:3 => 1308790980
-86: 20110623 1:30 => 1308792600
-87: 20110623 12:12:3 => 1308831123
-88: 20110623 01:12:3 => 1308791523
-89: 20110623 01:99:30 => -1
 </stdout>
 
 # This test case previously tested an overflow case ("2094 Nov 6 =>
diff --git a/tests/libtest/lib517.c b/tests/libtest/lib517.c
index af7b2aa7a..a30c2d5ce 100644
--- a/tests/libtest/lib517.c
+++ b/tests/libtest/lib517.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -23,117 +23,141 @@
 
 #include "memdebug.h"
 
-static const char * const dates[]={
-  "Sun, 06 Nov 1994 08:49:37 GMT",
-  "Sunday, 06-Nov-94 08:49:37 GMT",
-  "Sun Nov  6 08:49:37 1994",
-  "06 Nov 1994 08:49:37 GMT",
-  "06-Nov-94 08:49:37 GMT",
-  "Nov  6 08:49:37 1994",
-  "06 Nov 1994 08:49:37",
-  "06-Nov-94 08:49:37",
-  "1994 Nov 6 08:49:37",
-  "GMT 08:49:37 06-Nov-94 Sunday",
-  "94 6 Nov 08:49:37",
-  "1994 Nov 6",
-  "06-Nov-94",
-  "Sun Nov 6 94",
-  "1994.Nov.6",
-  "Sun/Nov/6/94/GMT",
-  "Sun, 06 Nov 1994 08:49:37 CET",
-  "06 Nov 1994 08:49:37 EST",
-  "Sun, 12 Sep 2004 15:05:58 -0700",
-  "Sat, 11 Sep 2004 21:32:11 +0200",
-  "20040912 15:05:58 -0700",
-  "20040911 +0200",
-  "Thu, 01-Jan-1970 00:59:59 GMT",
-  "Thu, 01-Jan-1970 01:00:00 GMT",
-/*  "2094 Nov 6", See ../data/test517 for details */
-  "Sat, 15-Apr-17 21:01:22 GMT",
-  "Thu, 19-Apr-2007 16:00:00 GMT",
-  "Wed, 25 Apr 2007 21:02:13 GMT",
-  "Thu, 19/Apr\\2007 16:00:00 GMT",
-  "Fri, 1 Jan 2010 01:01:50 GMT",
-  "Wednesday, 1-Jan-2003 00:00:00 GMT",
-  ", 1-Jan-2003 00:00:00 GMT",
-  " 1-Jan-2003 00:00:00 GMT",
-  "1-Jan-2003 00:00:00 GMT",
-  "Wed,18-Apr-07 22:50:12 GMT",
-  "WillyWonka  , 18-Apr-07 22:50:12 GMT",
-  "WillyWonka  , 18-Apr-07 22:50:12",
-  "WillyWonka  ,  18-apr-07   22:50:12",
-  "Mon, 18-Apr-1977 22:50:13 GMT",
-  "Mon, 18-Apr-77 22:50:13 GMT",
-  "\"Sat, 15-Apr-17\\\"21:01:22\\\"GMT\"",
-  "Partyday, 18- April-07 22:50:12",
-  "Partyday, 18 - Apri-07 22:50:12",
-  "Wednes, 1-Januar-2003 00:00:00 GMT",
-  "Sat, 15-Apr-17 21:01:22",
-  "Sat, 15-Apr-17 21:01:22 GMT-2",
-  "Sat, 15-Apr-17 21:01:22 GMT BLAH",
-  "Sat, 15-Apr-17 21:01:22 GMT-0400",
-  "Sat, 15-Apr-17 21:01:22 GMT-0400 (EDT)",
-  "Sat, 15-Apr-17 21:01:22 DST",
-  "Sat, 15-Apr-17 21:01:22 -0400",
-  "Sat, 15-Apr-17 21:01:22 (hello there)",
-  "Sat, 15-Apr-17 21:01:22 11:22:33",
-  "Sat, 15-Apr-17 ::00 21:01:22",
-  "Sat, 15-Apr-17 boink:z 21:01:22",
-  "Sat, 15-Apr-17 91:22:33 21:01:22",
-  "Thu Apr 18 22:50:12 2007 GMT",
-  "22:50:12 Thu Apr 18 2007 GMT",
-  "Thu 22:50:12 Apr 18 2007 GMT",
-  "Thu Apr 22:50:12 18 2007 GMT",
-  "Thu Apr 18 22:50:12 2007 GMT",
-  "Thu Apr 18 2007 22:50:12 GMT",
-  "Thu Apr 18 2007 GMT 22:50:12",
-  "Sat, 15-Apr-17 21:01:22 GMT",
-  "15-Sat, Apr-17 21:01:22 GMT",
-  "15-Sat, Apr 21:01:22 GMT 17",
-  "15-Sat, Apr 21:01:22 GMT 2017",
-  "15 Apr 21:01:22 2017",
-  "15 17 Apr 21:01:22",
-  "Apr 15 17 21:01:22",
-  "Apr 15 21:01:22 17",
-  "2017 April 15 21:01:22",
-  "15 April 2017 21:01:22",
-  "98 April 17 21:01:22",
-  "Thu, 012-Aug-2008 20:49:07 GMT",
+struct dcheck {
+  const char *input;
+  time_t output;
+};
+
+struct dcheck dates[] = {
+  {"Sun, 06 Nov 1994 08:49:37 GMT", 784111777 },
+  {"Sunday, 06-Nov-94 08:49:37 GMT", 784111777 },
+  {"Sun Nov  6 08:49:37 1994", 784111777 },
+  {"06 Nov 1994 08:49:37 GMT", 784111777 },
+  {"06-Nov-94 08:49:37 GMT", 784111777 },
+  {"Nov  6 08:49:37 1994", 784111777 },
+  {"06 Nov 1994 08:49:37", 784111777 },
+  {"06-Nov-94 08:49:37", 784111777 },
+  {"1994 Nov 6 08:49:37", 784111777 },
+  {"GMT 08:49:37 06-Nov-94 Sunday", 784111777 },
+  {"94 6 Nov 08:49:37", 784111777 },
+  {"1994 Nov 6", 784080000 },
+  {"06-Nov-94", 784080000 },
+  {"Sun Nov 6 94", 784080000 },
+  {"1994.Nov.6", 784080000 },
+  {"Sun/Nov/6/94/GMT", 784080000 },
+  {"Sun, 06 Nov 1994 08:49:37 CET", 784108177 },
+  {"06 Nov 1994 08:49:37 EST", 784129777 },
+  {"Sun, 12 Sep 2004 15:05:58 -0700", 1095026758 },
+  {"Sat, 11 Sep 2004 21:32:11 +0200", 1094931131 },
+  {"20040912 15:05:58 -0700", 1095026758 },
+  {"20040911 +0200", 1094853600 },
+  {"Thu, 01-Jan-1970 00:59:59 GMT", 3599 },
+  {"Thu, 01-Jan-1970 01:00:00 GMT", 3600 },
+  {"Sat, 15-Apr-17 21:01:22 GMT", 1492290082 },
+  {"Thu, 19-Apr-2007 16:00:00 GMT", 1176998400 },
+  {"Wed, 25 Apr 2007 21:02:13 GMT", 1177534933 },
+  {"Thu, 19/Apr\\2007 16:00:00 GMT", 1176998400 },
+  {"Fri, 1 Jan 2010 01:01:50 GMT", 1262307710 },
+  {"Wednesday, 1-Jan-2003 00:00:00 GMT", 1041379200 },
+  {", 1-Jan-2003 00:00:00 GMT", 1041379200 },
+  {"1-Jan-2003 00:00:00 GMT", 1041379200 },
+  {"1-Jan-2003 00:00:00 GMT", 1041379200 },
+  {"Wed,18-Apr-07 22:50:12 GMT", 1176936612 },
+  {"WillyWonka  , 18-Apr-07 22:50:12 GMT", -1 },
+  {"WillyWonka  , 18-Apr-07 22:50:12", -1 },
+  {"WillyWonka  ,  18-apr-07   22:50:12", -1 },
+  {"Mon, 18-Apr-1977 22:50:13 GMT", 230251813 },
+  {"Mon, 18-Apr-77 22:50:13 GMT", 230251813 },
+  {"Sat, 15-Apr-17\"21:01:22\"GMT", 1492290082 },
+  {"Partyday, 18- April-07 22:50:12", -1 },
+  {"Partyday, 18 - Apri-07 22:50:12", -1 },
+  {"Wednes, 1-Januar-2003 00:00:00 GMT", -1 },
+  {"Sat, 15-Apr-17 21:01:22", 1492290082 },
+  {"Sat, 15-Apr-17 21:01:22 GMT-2", 1492290082 },
+  {"Sat, 15-Apr-17 21:01:22 GMT BLAH", 1492290082 },
+  {"Sat, 15-Apr-17 21:01:22 GMT-0400", 1492290082 },
+  {"Sat, 15-Apr-17 21:01:22 GMT-0400 (EDT)", 1492290082 },
+  {"Sat, 15-Apr-17 21:01:22 DST", -1 },
+  {"Sat, 15-Apr-17 21:01:22 -0400", 1492304482 },
+  {"Sat, 15-Apr-17 21:01:22 (hello there)", -1 },
+  {"Sat, 15-Apr-17 21:01:22 11:22:33", -1 },
+  {"Sat, 15-Apr-17 ::00 21:01:22", -1 },
+  {"Sat, 15-Apr-17 boink:z 21:01:22", -1 },
+  {"Sat, 15-Apr-17 91:22:33 21:01:22", -1 },
+  {"Thu Apr 18 22:50:12 2007 GMT", 1176936612 },
+  {"22:50:12 Thu Apr 18 2007 GMT", 1176936612 },
+  {"Thu 22:50:12 Apr 18 2007 GMT", 1176936612 },
+  {"Thu Apr 22:50:12 18 2007 GMT", 1176936612 },
+  {"Thu Apr 18 22:50:12 2007 GMT", 1176936612 },
+  {"Thu Apr 18 2007 22:50:12 GMT", 1176936612 },
+  {"Thu Apr 18 2007 GMT 22:50:12", 1176936612 },
+  {"Sat, 15-Apr-17 21:01:22 GMT", 1492290082 },
+  {"15-Sat, Apr-17 21:01:22 GMT", 1492290082 },
+  {"15-Sat, Apr 21:01:22 GMT 17", 1492290082 },
+  {"15-Sat, Apr 21:01:22 GMT 2017", 1492290082 },
+  {"15 Apr 21:01:22 2017", 1492290082 },
+  {"15 17 Apr 21:01:22", 1492290082 },
+  {"Apr 15 17 21:01:22", 1492290082 },
+  {"Apr 15 21:01:22 17", 1492290082 },
+  {"2017 April 15 21:01:22", -1 },
+  {"15 April 2017 21:01:22", -1 },
+  {"98 April 17 21:01:22", -1 },
+  {"Thu, 012-Aug-2008 20:49:07 GMT", 1218574147 },
+  {"Thu, 999999999999-Aug-2007 20:49:07 GMT", -1 },
+  {"Thu, 12-Aug-2007 20:61:99999999999 GMT", -1 },
+  {"IAintNoDateFool", -1 },
+  {"Thu Apr 18 22:50 2007 GMT", 1176936600 },
+  {"20110623 12:34:56", 1308832496 },
+  {"20110632 12:34:56", -1 },
+  {"20110623 56:34:56", -1 },
+  {"20111323 12:34:56", -1 },
+  {"20110623 12:34:79", -1 },
+  {"Wed, 31 Dec 2008 23:59:60 GMT", 1230768000 },
+  {"20110623 12:3", 1308830580 },
+  {"20110623 1:3", 1308790980 },
+  {"20110623 1:30", 1308792600 },
+  {"20110623 12:12:3", 1308831123 },
+  {"20110623 01:12:3", 1308791523 },
+  {"20110623 01:99:30", -1 },
+  {"Thu, 01-Jan-1970 00:00:00 GMT", 0 },
+  {"Thu, 31-Dec-1969 23:59:58 GMT", -2 },
+  {"Thu, 31-Dec-1969 23:59:59 GMT", 0 }, /* avoids -1 ! */
+#if SIZEOF_TIME_T > 4
+  {"Sun, 06 Nov 2044 08:49:37 GMT", 2362034977 },
+  {"Sun, 06 Nov 3144 08:49:37 GMT", 37074617377 },
+#ifndef HAVE_TIME_T_UNSIGNED
 #if 0
-  /* leaving out these strings since they differ between 32 and 64 bit
-     archs and the test suite has no good way to support two different outputs
-     like that */
-  "Thu, 12-Aug-31841 20:49:07 GMT",
-  "Thu, 12-Aug-9999999999 20:49:07 GMT",
+  /* causes warning on MSVC */
+  {"Sun, 06 Nov 1900 08:49:37 GMT", -2182259423 },
+#endif
+  {"Sun, 06 Nov 1800 08:49:37 GMT", -5337933023 },
+  {"Thu, 01-Jan-1583 00:00:00 GMT", -12212553600 },
+#endif
+  {"Thu, 01-Jan-1499 00:00:00 GMT", -1 },
+#else
+  {"Sun, 06 Nov 2044 08:49:37 GMT", -1 },
+#endif
+#ifndef HAVE_TIME_T_UNSIGNED
+  {"Sun, 06 Nov 1968 08:49:37 GMT", -36342623 },
 #endif
-  "Thu, 999999999999-Aug-2007 20:49:07 GMT",
-  "Thu, 12-Aug-2007 20:61:99999999999 GMT",
-  "IAintNoDateFool",
-  "Thu Apr 18 22:50 2007 GMT", /* without seconds */
-  "20110623 12:34:56",
-  "20110632 12:34:56",
-  "20110623 56:34:56",
-  "20111323 12:34:56",
-  "20110623 12:34:79",
-  "Wed, 31 Dec 2008 23:59:60 GMT", /* leap second */
-  "20110623 12:3",
-  "20110623 1:3",
-  "20110623 1:30",
-  "20110623 12:12:3",
-  "20110623 01:12:3",
-  "20110623 01:99:30",
-  NULL
+  { NULL, 0 }
 };
 
 int test(char *URL)
 {
   int i;
+  int error = 0;
 
   (void)URL; /* not used */
 
-  for(i = 0; dates[i]; i++) {
-    printf("%d: %s => %ld\n", i, dates[i], (long)curl_getdate(dates[i], NULL));
+  for(i = 0; dates[i].input; i++) {
+    time_t out = curl_getdate(dates[i].input, NULL);
+    if(out != dates[i].output) {
+      printf("WRONGLY %s => %ld (instead of %ld)\n",
+             dates[i].input, out, dates[i].output);
+      error++;
+    }
   }
 
-  return 0;
+  return error;
 }