--- a/debian/patches/0010-yat2m-source-date-epoch.patch	1970-01-01 02:00:00.000000000 +0200
--- b/debian/patches/0010-yat2m-source-date-epoch.patch	2015-11-27 23:40:28.619516450 +0200
@@ -0,0 +1,45 @@
+--- gnupg-1.4.19.orig/doc/yat2m.c
++++ gnupg-1.4.19/doc/yat2m.c
+@@ -102,6 +102,7 @@
+ #include <assert.h>
+ #include <ctype.h>
+ #include <time.h>
++#include <limits.h>
+ 
+ 
+ #define PGM "yat2m"
+--- gnupg-1.4.19.orig/doc/yat2m.c
++++ gnupg-1.4.19/doc/yat2m.c
+@@ -324,6 +324,32 @@ isodatestring (void)
+   static char buffer[11+5];
+   struct tm *tp;
+   time_t atime = time (NULL);
++  char *endptr;
++  char *source_date_epoch = getenv("SOURCE_DATE_EPOCH");
++  unsigned long long epoch;
++
++  if (source_date_epoch) {
++    errno = 0;
++    epoch = strtoull(source_date_epoch, &endptr, 10);
++    if ((errno == ERANGE && (epoch == ULLONG_MAX || epoch == 0))
++        || (errno != 0 && epoch == 0)) {
++      fprintf(stderr, "Environment variable $SOURCE_DATE_EPOCH: strtoull: %s\n", strerror(errno));
++      exit(EXIT_FAILURE);
++    }
++    if (endptr == source_date_epoch) {
++      fprintf(stderr, "Environment variable $SOURCE_DATE_EPOCH: No digits were found: %s\n", endptr);
++      exit(EXIT_FAILURE);
++    }
++    if (*endptr != '\0') {
++      fprintf(stderr, "Environment variable $SOURCE_DATE_EPOCH: Trailing garbage: %s\n", endptr);
++      exit(EXIT_FAILURE);
++    }
++    if (epoch > ULONG_MAX) {
++      fprintf(stderr, "Environment variable $SOURCE_DATE_EPOCH: value must be smaller than or equal to: %lu but was found to be: %llu \n", ULONG_MAX  ,epoch);
++      exit(EXIT_FAILURE);
++    }
++    atime = epoch;
++  }
+ 
+   if (atime < 0)
+     strcpy (buffer, "????" "-??" "-??");
--- a/debian/patches/series	2015-11-27 23:13:53.501216055 +0200
--- b/debian/patches/series	2015-11-27 23:42:12.260174185 +0200
@@ -7,3 +7,4 @@
 0007-Pass-DBUS_SESSION_BUS_ADDRESS-for-gnome3.patch
 0008-gpg-Silence-a-compiler-warning.patch
 0009-po-Fix-Spanish-translation.patch
+0010-yat2m-source-date-epoch.patch