diff --git a/WHATSNEW b/WHATSNEW
index 7054b8a13..5e6e2bd96 100644
--- a/WHATSNEW
+++ b/WHATSNEW
@@ -78,6 +78,8 @@ Fixed bugs:
 
 * checksum fileext property doc wrong. Bugzilla 30787.
 
+* FTP task, getTimeDiff method was returning wrong value. Bugzilla 30595.
+
 Changes from Ant 1.6.1 to Ant 1.6.2
 ===================================
 
diff --git a/src/main/org/apache/tools/ant/taskdefs/optional/net/FTP.java b/src/main/org/apache/tools/ant/taskdefs/optional/net/FTP.java
index 213b984fd..900c0da37 100644
--- a/src/main/org/apache/tools/ant/taskdefs/optional/net/FTP.java
+++ b/src/main/org/apache/tools/ant/taskdefs/optional/net/FTP.java
@@ -1497,7 +1497,7 @@ public class FTP
                 FTPFile [] ftpFiles = ftp.listFiles(tempFile.getName());
                 if (ftpFiles.length == 1) {
                     long remoteTimeStamp = ftpFiles[0].getTimestamp().getTime().getTime();
-                    returnValue = remoteTimeStamp - localTimeStamp;
+                    returnValue = localTimeStamp - remoteTimeStamp;
                 }
                 ftp.deleteFile(ftpFiles[0].getName());
             }