Index: Mk/bsd.port.mk
===================================================================
--- Mk/bsd.port.mk
+++ Mk/bsd.port.mk
@@ -2027,6 +2027,11 @@
 .endif
 FRAMEWORK_REINPLACE_CMD?=	${SED} -i.bak
 
+_TIMESTAMP!=	${AWK} -F= -v ts=0 '/^TIMESTAMP/ { ts=$$2 } END { print ts}' ${DISTINFO_FILE}
+.if ${_TIMESTAMP} != 0
+MAKE_ENV+=	SOURCE_DATE_EPOCH=${_TIMESTAMP}
+.endif
+
 # Names of cookies used to skip already completed stages
 EXTRACT_COOKIE?=	${WRKDIR}/.extract_done.${PORTNAME}.${PREFIX:S/\//_/g}
 CONFIGURE_COOKIE?=	${WRKDIR}/.configure_done.${PORTNAME}.${PREFIX:S/\//_/g}
@@ -3427,6 +3432,9 @@
 
 .if !target(do-package)
 PKG_CREATE_ARGS=	-r ${STAGEDIR}
+.if ${_TIMESTAMP} != 0
+PKG_CREATE_ARGS+=	-t ${_TIMESTAMP}
+.endif
 .  if defined(PKG_CREATE_VERBOSE)
 PKG_CREATE_ARGS+=	-v
 .  endif