--- jisp-2.5.1/Makefile	2024-09-23 17:44:21.056217694 +0200
+++ jisp-2.5.1/Makefile	2024-09-23 17:48:23.961290309 +0200
@@ -12,8 +12,8 @@
         
 jars:
 	-rm -rf *.jar
-	jar -cfm jisp-demo.jar MANIFEST.MF *.class svfl.txt
-	jar -cfm jisp.jar JISPJAR.MF com/coyotegulch/jisp/*.class svfl.txt
+	jar --date="$$(date -u -d @$${SOURCE_DATE_EPOCH:-$$(date +%s)} +%Y-%m-%dT%H:%M:%SZ)" --create --file=jisp-demo.jar --manifest=MANIFEST.MF *.class svfl.txt
+	jar --date="$$(date -u -d @$${SOURCE_DATE_EPOCH:-$$(date +%s)} +%Y-%m-%dT%H:%M:%SZ)" --create --file=jisp.jar --manifest=JISPJAR.MF com/coyotegulch/jisp/*.class svfl.txt
 	
 docs:
 	javadoc -d docs -notimestamp com.coyotegulch.jisp