diff --git a/Makefile b/Makefile
index 5e33043..394ed09 100644
--- a/Makefile
+++ b/Makefile
@@ -1230,9 +1230,10 @@ define filechk_version.h
 endef
 
 define filechk_timestamp.h
-	(LC_ALL=C date +'#define U_BOOT_DATE "%b %d %C%y"'; \
-	LC_ALL=C date +'#define U_BOOT_TIME "%T"'; \
-	LC_ALL=C date +'#define U_BOOT_TZ "%z"')
+	(SOURCE_DATE="$${SOURCE_DATE_EPOCH:+@$$SOURCE_DATE_EPOCH}"; \
+	LC_ALL=C date -u -d "$${SOURCE_DATE:-now}" +'#define U_BOOT_DATE "%b %d %C%y"'; \
+	LC_ALL=C date -u -d "$${SOURCE_DATE:-now}" +'#define U_BOOT_TIME "%T"'; \
+	LC_ALL=C date -u -d "$${SOURCE_DATE:-now}" +'#define U_BOOT_TZ "%z"' )
 endef
 
 $(version_h): include/config/uboot.release FORCE
diff --git a/README b/README
index 4e0ff9f..1bcb63c 100644
--- a/README
+++ b/README
@@ -5081,6 +5081,18 @@ This firmware often needs to be loaded during U-Boot booting.
 - CONFIG_SYS_MEM_TOP_HIDE_MIN
 	Define minimum DDR size to be hided from top of the DDR memory
 
+Reproducible builds
+-------------------
+
+In order to achieve reproducible builds, timestamps used in the U-Boot build
+process have to be set to a fixed value.
+
+This is done using the SOURCE_DATE_EPOCH environment variable.
+SOURCE_DATE_EPOCH is to be set on the build host's shell, not as a configuration
+option for U-Boot or an environment variable in U-Boot.
+
+SOURCE_DATE_EPOCH should be set to a number of seconds since the epoch, in UTC.
+
 Building the Software:
 ======================
 
diff --git a/tools/default_image.c b/tools/default_image.c
index cf5c0d4..18940af 100644
--- a/tools/default_image.c
+++ b/tools/default_image.c
@@ -88,6 +88,9 @@ static void image_set_header(void *ptr, struct stat *sbuf, int ifd,
 				struct image_tool_params *params)
 {
 	uint32_t checksum;
+	char *source_date_epoch;
+	struct tm *time_universal;
+	time_t time;
 
 	image_header_t * hdr = (image_header_t *)ptr;
 
@@ -96,9 +99,25 @@ static void image_set_header(void *ptr, struct stat *sbuf, int ifd,
 				sizeof(image_header_t)),
 			sbuf->st_size - sizeof(image_header_t));
 
+	source_date_epoch = getenv("SOURCE_DATE_EPOCH");
+	if (source_date_epoch != NULL) {
+		time = (time_t) strtol(source_date_epoch, NULL, 10);
+
+		time_universal = gmtime(&time);
+		if (time_universal == NULL) {
+			fprintf(stderr, "%s: SOURCE_DATE_EPOCH is not valid\n",
+				__func__);
+			time = 0;
+		} else {
+			time = mktime(time_universal);
+		}
+	} else {
+		time = sbuf->st_mtime;
+	}
+
 	/* Build new header */
 	image_set_magic(hdr, IH_MAGIC);
-	image_set_time(hdr, sbuf->st_mtime);
+	image_set_time(hdr, time);
 	image_set_size(hdr, sbuf->st_size - sizeof(image_header_t));
 	image_set_load(hdr, params->addr);
 	image_set_ep(hdr, params->ep);