--- a/debian/rules	2020-06-24 10:06:14.394164865 +0100
--- b/debian/rules	2020-06-24 10:17:09.051304611 +0100
@@ -1,6 +1,9 @@
 #!/usr/bin/make -f
 
 include /usr/share/dpkg/architecture.mk
+include /usr/share/dpkg/pkg-info.mk
+
+BUILD_DATE = $(shell date --utc --date="@$(SOURCE_DATE_EPOCH)" +%Y-%m-%d)
 
 export CRITCL_VER := $(shell sed -n "/package provide critcl/s/.*critcl //gp" lib/critcl/critcl.tcl)
 
@@ -33,6 +36,8 @@
 		rm -rf debian/critcl/usr/share/tcltk/critcl$(CRITCL_VER)/critcl_c/tcl$$d; \
 		ln -s /usr/include/tcl$$d debian/critcl/usr/share/tcltk/critcl$(CRITCL_VER)/critcl_c/tcl$$d; \
 	done
+	find debian/critcl/usr -name teapot.txt -print0 | \
+		xargs -0r sed -i -e 's,^\(Meta build::date\).*,\1 $(BUILD_DATE),'
 
 override_dh_installman:
 	mkdir -p debian/tmp/man