--- apache-ant-1.10.14/src/main/org/apache/tools/ant/taskdefs/condition/IsLastModified.java	2024-07-22 09:18:51.385562681 +0200
+++ apache-ant-1.10.14/src/main/org/apache/tools/ant/taskdefs/condition/IsLastModified.java	2024-07-22 10:01:32.218061839 +0200
@@ -128,6 +128,9 @@
             return millis;
         }
         if ("now".equalsIgnoreCase(dateTime)) {
+            if ( System.getenv("SOURCE_DATE_EPOCH") != null ) {
+                return 1000 * Long.parseLong(System.getenv("SOURCE_DATE_EPOCH"));
+            }
             return System.currentTimeMillis();
         }
         DateFormat df = dfFactory.getPrimaryFormat();
--- apache-ant-1.10.14/src/main/org/apache/tools/ant/taskdefs/Jar.java	2024-07-22 09:18:51.382229324 +0200
+++ apache-ant-1.10.14/src/main/org/apache/tools/ant/taskdefs/Jar.java	2024-07-22 09:19:09.242362668 +0200
@@ -450,6 +450,13 @@
         serviceList.add(service);
     }
 
+    private long currentTimeMillisOrSourceDateEpoch() {
+        if ( System.getenv("SOURCE_DATE_EPOCH") != null ) {
+            return 1000 * Long.parseLong(System.getenv("SOURCE_DATE_EPOCH"));
+        }
+        return System.currentTimeMillis();
+    }
+
     /**
      * Write SPI Information to JAR
      */
@@ -459,7 +466,7 @@
                 //stolen from writeManifest
                super.zipFile(is, zOut,
                              "META-INF/services/" + service.getType(),
-                             System.currentTimeMillis(), null,
+                             currentTimeMillisOrSourceDateEpoch(), null,
                              ZipFileSet.DEFAULT_FILE_MODE);
            }
         }
@@ -579,7 +586,7 @@
             new ByteArrayInputStream(baos.toByteArray());
         try {
             super.zipFile(bais, zOut, MANIFEST_NAME,
-                          System.currentTimeMillis(), null,
+                          currentTimeMillisOrSourceDateEpoch(), null,
                           ZipFileSet.DEFAULT_FILE_MODE);
         } finally {
             // not really required
@@ -656,7 +663,7 @@
         writer.close();
         try (ByteArrayInputStream bais =
             new ByteArrayInputStream(baos.toByteArray())) {
-            super.zipFile(bais, zOut, INDEX_NAME, System.currentTimeMillis(),
+            super.zipFile(bais, zOut, INDEX_NAME, currentTimeMillisOrSourceDateEpoch(),
                           null, ZipFileSet.DEFAULT_FILE_MODE);
         }
     }
--- apache-ant-1.10.14/src/main/org/apache/tools/ant/taskdefs/Zip.java	2024-07-22 09:18:51.385562681 +0200
+++ apache-ant-1.10.14/src/main/org/apache/tools/ant/taskdefs/Zip.java	2024-07-22 09:19:09.242362668 +0200
@@ -682,6 +682,7 @@
                     "Failed to create missing parent directory for %s",
                     zipFile);
             }
+            parent.setLastModified(currentTimeMillisOrSourceDateEpoch());
 
             updatedFile = true;
             if (!zipFile.exists() && state.isWithoutAnyResources()) {
@@ -1669,6 +1670,13 @@
             extra);
     }
 
+    private long currentTimeMillisOrSourceDateEpoch() {
+        if ( System.getenv("SOURCE_DATE_EPOCH") != null ) {
+            return 1000 * Long.parseLong(System.getenv("SOURCE_DATE_EPOCH"));
+        }
+        return System.currentTimeMillis();
+    }
+
     /**
      * Add a directory to the zip stream.
      * @param dir  the directory to add to the archive
@@ -1708,7 +1716,7 @@
             } else if (dir != null && dir.isExists()) {
                 ze.setTime(dir.getLastModified() + millisToAdd);
             } else {
-                ze.setTime(System.currentTimeMillis() + millisToAdd);
+                ze.setTime(currentTimeMillisOrSourceDateEpoch() + millisToAdd);
             }
             ze.setSize(0);
             ze.setMethod(ZipEntry.STORED);
@@ -1794,7 +1802,11 @@
 
         if (!skipWriting) {
             final ZipEntry ze = new ZipEntry(vPath);
-            ze.setTime(fixedModTime != null ? modTimeMillis : lastModified);
+            long newLastModified = lastModified;
+            if ( System.getenv("SOURCE_DATE_EPOCH") != null ) {
+                newLastModified = 1000 * Long.parseLong(System.getenv("SOURCE_DATE_EPOCH"));
+            }
+            ze.setTime(fixedModTime != null ? modTimeMillis : newLastModified);
             ze.setMethod(doCompress ? ZipEntry.DEFLATED : ZipEntry.STORED);
             // if the input stream doesn't support mark/reset ability, we wrap it in a
             // stream that adds that support.
--- apache-ant-1.10.14/src/main/org/apache/tools/zip/ZipOutputStream.java	2024-07-22 09:18:51.405562831 +0200
+++ apache-ant-1.10.14/src/main/org/apache/tools/zip/ZipOutputStream.java	2024-07-22 10:00:20.874193063 +0200
@@ -791,6 +791,9 @@
 
         if (entry.getTime() == -1) { // not specified
             entry.setTime(System.currentTimeMillis());
+            if ( System.getenv("SOURCE_DATE_EPOCH") != null ) {
+                entry.setTime(1000 * Long.parseLong(System.getenv("SOURCE_DATE_EPOCH")));
+            }
         }
     }