--- a/src/java.base/share/classes/java/util/Properties.java
+++ b/src/java.base/share/classes/java/util/Properties.java
@@ -929,7 +929,11 @@ class Properties extends Hashtable<Object,Object> {
         if (comments != null) {
             writeComments(bw, comments);
         }
-        bw.write("#" + new Date().toString());
+        Date now = new Date();
+        if (System.getenv("SOURCE_DATE_EPOCH") != null) {
+            now = new Date(1000 * Long.parseLong(System.getenv("SOURCE_DATE_EPOCH")));
+        }
+        bw.write("#" + now.toString());
         bw.newLine();
         synchronized (this) {
             for (Map.Entry<Object, Object> e : entrySet()) {