Merge pull request #2855 from Foxboron/morten/reprobuilds

Author: cpuguy83

scripts/build/.variables

@@ -6,7 +6,7 @@ TARGET=${TARGET:-"build"}
 PLATFORM=${PLATFORM:-}
 VERSION=${VERSION:-$(git describe --match 'v[0-9]*' --dirty='.m' --always --tags | sed 's/^v//' 2>/dev/null || echo "unknown-version" )}
 GITCOMMIT=${GITCOMMIT:-$(git rev-parse --short HEAD 2> /dev/null || true)}
-BUILDTIME=${BUILDTIME:-$(date -u +"%Y-%m-%dT%H:%M:%SZ")}
+BUILDTIME=${BUILDTIME:-$(date -u --date="@${SOURCE_DATE_EPOCH:-$(date +%s)}" +"%Y-%m-%dT%H:%M:%SZ")}
 
 PLATFORM_LDFLAGS=
 if test -n "${PLATFORM}"; then