2 files changed, 16 insertions, 3 deletions

diff --git a/scripts/gen_build_files.sh b/scripts/gen_build_files.sh
index 92de681ac..8b5b15a1b 100755
--- a/scripts/gen_build_files.sh
+++ b/scripts/gen_build_files.sh
@@ -4,6 +4,8 @@
 # but users complain that many sed implementations
 # are misinterpreting --.
 
+export LC_ALL=C
+
 test $# -ge 2 || { echo "Syntax: $0 SRCTREE OBJTREE"; exit 1; }
 
 # cd to objtree
diff --git a/scripts/kconfig/confdata.c b/scripts/kconfig/confdata.c
index d6c1621b8..2f7fa6618 100644
--- a/scripts/kconfig/confdata.c
+++ b/scripts/kconfig/confdata.c
@@ -342,6 +342,8 @@ int conf_write(const char *name)
         time_t now;
         int use_timestamp = 1;
         char *env;
+        char *source_date_epoch;
+        struct tm *build_time;
 
         dirname[0] = 0;
         if (name && name[0]) {
@@ -378,7 +380,16 @@ int conf_write(const char *name)
         }
         sym = sym_lookup("KERNELVERSION", 0);
         sym_calc_value(sym);
-        time(&now);
+
+        source_date_epoch = getenv("SOURCE_DATE_EPOCH");
+        if (source_date_epoch && *source_date_epoch) {
+                now = strtoull(source_date_epoch, NULL, 10);
+                build_time = gmtime(&now);
+        } else {
+                time(&now);
+                build_time = localtime(&now);
+        }
+
         env = getenv("KCONFIG_NOTIMESTAMP");
         if (env && *env)
                 use_timestamp = 0;
@@ -398,14 +409,14 @@ int conf_write(const char *name)
                 if (use_timestamp) {
                         size_t ret = \
                                 strftime(buf, sizeof(buf), "#define AUTOCONF_TIMESTAMP "
-                                        "\"%Y-%m-%d %H:%M:%S %Z\"\n", localtime(&now));
+                                        "\"%Y-%m-%d %H:%M:%S %Z\"\n", build_time);
                         /* if user has Factory timezone or some other odd install, the
                          * %Z above will overflow the string leaving us with undefined
                          * results ... so let's try again without the timezone.
                          */
                         if (ret == 0)
                                 strftime(buf, sizeof(buf), "#define AUTOCONF_TIMESTAMP "
-                                        "\"%Y-%m-%d %H:%M:%S\"\n", localtime(&now));
+                                        "\"%Y-%m-%d %H:%M:%S\"\n", build_time);
                 } else { /* bbox */
                         strcpy(buf, "#define AUTOCONF_TIMESTAMP \"\"\n");
                 }