--- techblue-jmagick-586c8bb/Makefile	2024-09-24 06:52:15.460600838 +0200
+++ techblue-jmagick-586c8bb/Makefile	2024-09-24 06:58:52.746108810 +0200
@@ -27,7 +27,9 @@
 endif
 
 all: dir default-target
-	cd classes; $(JAR) cvf $(JAR_FILE) magick resources
+	cd classes; $(JAR) \
+                --date="$$(date -u -d @$${SOURCE_DATE_EPOCH:-$$(date +%s)} +%Y-%m-%dT%H:%M:%SZ)" \
+                --create --verbose --file=$(JAR_FILE) magick resources
 
 include $(MAKE_PATH)/Make.rules