diff -up libical-1.0/src/libical/icaltime.c.old libical-1.0/src/libical/icaltime.c
--- libical-1.0/src/libical/icaltime.c.old	2014-11-26 13:29:50.809112801 +0100
+++ libical-1.0/src/libical/icaltime.c	2014-11-26 14:14:42.309998754 +0100
@@ -77,7 +77,7 @@
  *  local daylight savings time applied to the result.
  *  This function expects well-formed input.
  */
-static time_t make_time(struct tm *tm, int tzm)
+static time_t make_time(struct tm *tm, int tzm, int be_strict)
 {
   time_t tim;
 
@@ -85,7 +85,7 @@ static time_t make_time(struct tm *tm, i
 
   /* check that year specification within range */
 
-  if (tm->tm_year < 70 || tm->tm_year > 138)
+  if (be_strict && sizeof (time_t) == 4 && (tm->tm_year < 70 || tm->tm_year > 138))
     return((time_t) -1);
 
   /* check that month specification within range */
@@ -96,7 +96,7 @@ static time_t make_time(struct tm *tm, i
   /* check for upper bound of Jan 17, 2038 (to avoid possibility of
      32-bit arithmetic overflow) */
   
-  if (tm->tm_year == 138) {
+  if (be_strict && sizeof (time_t) == 4 && tm->tm_year == 138) {
     if (tm->tm_mon > 0)
       return((time_t) -1);
     else if (tm->tm_mday > 17)
@@ -289,7 +289,7 @@ time_t icaltime_as_timet(const struct ic
     stm.tm_year = tt.year-1900;
     stm.tm_isdst = -1;
 
-    t = make_time(&stm, 0);
+    t = make_time(&stm, 0, 1);
 
     return t;
 
@@ -395,7 +395,7 @@ time_t icaltime_as_timet_with_zone(const
 {
     icaltimezone *utc_zone;
     struct tm stm;
-    time_t t;
+    time_t t, maketimeval;
     char *old_tz;
     struct icaltimetype local_tt;
     
@@ -427,6 +427,7 @@ time_t icaltime_as_timet_with_zone(const
 /* The functions putenv and mktime are not thread safe, inserting a lock
 to prevent any crashes */
 
+    maketimeval = make_time (&stm, 0, 0);
 #ifdef HAVE_PTHREAD
     pthread_mutex_lock (&tzid_mutex);
 #endif
@@ -442,6 +443,13 @@ to prevent any crashes */
 #ifdef HAVE_PTHREAD
     pthread_mutex_unlock (&tzid_mutex);
 #endif
+
+    if (t != maketimeval) {
+	    fprintf (stderr, "Time %d doesn't match expected %d for %d-%d-%dT%02d%02d%02d\n", (int) maketimeval, (int) t, stm.tm_year + 1900, stm.tm_mon + 1, stm.tm_mday, stm.tm_hour, stm.tm_min, stm.tm_sec);
+	    fflush (stderr);
+    }
+    assert (t == maketimeval);
+
     return t;
 }