diff --git a/DynmapCore/src/main/java/org/dynmap/DynmapWorld.java b/DynmapCore/src/main/java/org/dynmap/DynmapWorld.java
index 85ff89e1..fef1498e 100644
--- a/DynmapCore/src/main/java/org/dynmap/DynmapWorld.java
+++ b/DynmapCore/src/main/java/org/dynmap/DynmapWorld.java
@@ -128,6 +128,7 @@ public abstract class DynmapWorld {
     private static final int[] stepseq = { 3, 1, 2, 0 };
 
     private void processZoomFile(MapTypeState mts, MapStorageTile tile, boolean firstVariant) {
+        final long startTimestamp = System.currentTimeMillis();
         int step = 1 << tile.zoom;
         MapStorageTile ztile = tile.getZoomOutTile();
         int width = 128, height = 128;
@@ -238,7 +239,7 @@ public abstract class DynmapWorld {
                 }
             }
             else /* if (!ztile.matchesHashCode(crc)) */ {
-                ztile.write(crc, zIm);
+                ztile.write(crc, zIm, startTimestamp);
                 MapManager.mapman.pushUpdate(this, new Client.Tile(ztile.getURI()));
                 enqueueZoomOutUpdate(ztile);
             }
diff --git a/DynmapCore/src/main/java/org/dynmap/hdmap/IsoHDPerspective.java b/DynmapCore/src/main/java/org/dynmap/hdmap/IsoHDPerspective.java
index b3ef44f0..1b8772fa 100644
--- a/DynmapCore/src/main/java/org/dynmap/hdmap/IsoHDPerspective.java
+++ b/DynmapCore/src/main/java/org/dynmap/hdmap/IsoHDPerspective.java
@@ -1178,6 +1178,7 @@ public class IsoHDPerspective implements HDPerspective {
 
     @Override
     public boolean render(MapChunkCache cache, HDMapTile tile, String mapname) {
+        final long startTimestamp = System.currentTimeMillis();
         Color rslt = new Color();
         MapIterator mapiter = cache.getIterator(0, 0, 0);
         DynmapWorld world = tile.getDynmapWorld();
@@ -1305,7 +1306,7 @@ public class IsoHDPerspective implements HDPerspective {
                 if(mtile.matchesHashCode(crc) == false) {
                     /* Wrap buffer as buffered image */
                     if(rendered[i]) {   
-                        mtile.write(crc, im[i].buf_img);
+                        mtile.write(crc, im[i].buf_img, startTimestamp);
                     }
                     else {
                         mtile.delete();
@@ -1336,7 +1337,7 @@ public class IsoHDPerspective implements HDPerspective {
                     if(mtile.matchesHashCode(crc) == false) {
                         /* Wrap buffer as buffered image */
                         if(rendered[i]) {
-                            mtile.write(crc, dayim[i].buf_img);
+                            mtile.write(crc, dayim[i].buf_img, startTimestamp);
                         }
                         else {
                             mtile.delete();
diff --git a/DynmapCore/src/main/java/org/dynmap/storage/MapStorageTile.java b/DynmapCore/src/main/java/org/dynmap/storage/MapStorageTile.java
index 7a33f47e..d15b725b 100644
--- a/DynmapCore/src/main/java/org/dynmap/storage/MapStorageTile.java
+++ b/DynmapCore/src/main/java/org/dynmap/storage/MapStorageTile.java
@@ -57,7 +57,7 @@ public abstract class MapStorageTile {
      * @param encImage - output stream for encoded image
      * @return true if write succeeded
      */
-    public abstract boolean write(long hash, BufferOutputStream encImage);
+    public abstract boolean write(long hash, BufferOutputStream encImage, long timestamp);
     /**
      * Write tile from image
      * 
@@ -65,10 +65,10 @@ public abstract class MapStorageTile {
      * @param image - image to be encoded
      * @return true if write succeeded
      */
-    public boolean write(long hash, BufferedImage image) {
+    public boolean write(long hash, BufferedImage image, long timestamp) {
         BufferOutputStream bos = ImageIOManager.imageIOEncode(image, map.getImageFormat());
         if (bos != null) {
-            return write(hash, bos);
+            return write(hash, bos, timestamp);
         }
         return false;
     }
@@ -78,7 +78,7 @@ public abstract class MapStorageTile {
      * @return true if write succeeded
      */
     public boolean delete() {
-        return write(-1, (BufferOutputStream) null);
+        return write(-1, (BufferOutputStream) null, -1);
     }
     /**
      * Get write lock on tile
diff --git a/DynmapCore/src/main/java/org/dynmap/storage/filetree/FileTreeMapStorage.java b/DynmapCore/src/main/java/org/dynmap/storage/filetree/FileTreeMapStorage.java
index 11b597d2..fee5bab5 100644
--- a/DynmapCore/src/main/java/org/dynmap/storage/filetree/FileTreeMapStorage.java
+++ b/DynmapCore/src/main/java/org/dynmap/storage/filetree/FileTreeMapStorage.java
@@ -136,7 +136,7 @@ public class FileTreeMapStorage extends MapStorage {
         }
 
         @Override
-        public boolean write(long hash, BufferOutputStream encImage) {
+        public boolean write(long hash, BufferOutputStream encImage, long timestamp) {
             File ff = getTileFile(map.getImageFormat().getEncoding());
             List<File> ffalt = getTileFilesAltFormats();
             File ffpar = ff.getParentFile();
@@ -158,7 +158,7 @@ public class FileTreeMapStorage extends MapStorage {
             if (ffpar.exists() == false) {
                 ffpar.mkdirs();
             }
-            if (replaceFile(ff, encImage.buf, encImage.len) == false) {
+            if (replaceFile(ff, encImage.buf, encImage.len, timestamp) == false) {
                 return false;
             }
             hashmap.updateHashCode(world.getName() + "." + map.getPrefix(), x, y, hash);
@@ -627,8 +627,12 @@ public class FileTreeMapStorage extends MapStorage {
     public String getTilesURI(boolean login_enabled) {
         return login_enabled?"standalone/tiles.php?tile=":"tiles/";
     }
-    
+
     private boolean replaceFile(File f, byte[] b, int len) {
+        return replaceFile(f, b, len, System.currentTimeMillis());
+    }
+    
+    private boolean replaceFile(File f, byte[] b, int len, long timestamp) {
         boolean done = false;
         File fold = new File(f.getPath() + ".old");
         File fnew = new File(f.getPath() + ".new");
@@ -649,6 +653,8 @@ public class FileTreeMapStorage extends MapStorage {
                 else {
                     fnew.renameTo(f);
                 }
+                // Use the supplied timestamp
+                f.setLastModified(timestamp);
                 done = true;
             } catch (IOException iox) {
                 if (raf != null) { try { raf.close(); } catch (IOException x) {} }