Index: rocksdb-9.7.3/Makefile
===================================================================
--- rocksdb-9.7.3.orig/Makefile
+++ rocksdb-9.7.3/Makefile
@@ -816,9 +816,12 @@ ROCKSDB_PATCH = $(shell grep -E "ROCKSDB
 # the file needs to already exist or else the build will fail
 ifndef NO_UPDATE_BUILD_VERSION
 
-# By default, use the current date-time as the date.  If there are no changes,
-# we will use the last commit date instead.
-build_date := $(shell date "+%Y-%m-%d %T")
+DATE_FMT = %Y-%m-%d
+ifdef SOURCE_DATE_EPOCH
+	build_date ?= $(shell date -u -d "@$(SOURCE_DATE_EPOCH)" "+$(DATE_FMT)" 2>/dev/null || date -u -r "$(SOURCE_DATE_EPOCH)" "+$(DATE_FMT)" 2>/dev/null || date -u "+$(DATE_FMT)")
+else
+	build_date ?= $(shell date "+$(DATE_FMT)")
+endif
 
 ifdef FORCE_GIT_SHA
 	git_sha := $(FORCE_GIT_SHA)