diff --git a/src/main/java/org/apache/jenkins/gitpubsub/ASFGitSCMFileSystem.java b/src/main/java/org/apache/jenkins/gitpubsub/ASFGitSCMFileSystem.java
index 34e6fec..06f1471 100644
--- a/src/main/java/org/apache/jenkins/gitpubsub/ASFGitSCMFileSystem.java
+++ b/src/main/java/org/apache/jenkins/gitpubsub/ASFGitSCMFileSystem.java
@@ -1,4 +1,127 @@
 package org.apache.jenkins.gitpubsub;
 
-public class ASFGitSCMFileSystem {
+import com.cloudbees.plugins.credentials.common.StandardCredentials;
+import com.damnhandy.uri.template.UriTemplate;
+import edu.umd.cs.findbugs.annotations.NonNull;
+import hudson.Extension;
+import java.io.IOException;
+import java.net.URL;
+import java.text.ParseException;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+import java.util.Set;
+import jenkins.plugins.git.GitSCMTelescope;
+import jenkins.scm.api.SCMFile;
+import jenkins.scm.api.SCMFileSystem;
+import jenkins.scm.api.SCMHead;
+import jenkins.scm.api.SCMRevision;
+import org.jsoup.Jsoup;
+import org.jsoup.nodes.Document;
+import org.jsoup.nodes.Element;
+import org.jsoup.select.Elements;
+
+public class ASFGitSCMFileSystem extends SCMFileSystem {
+
+    /**
+     * Constructor.
+     *
+     * @param remote the remote.
+     * @param head   the head.
+     * @param rev    the revision.
+     */
+    public ASFGitSCMFileSystem(String remote, SCMHead head, SCMRevision rev) {
+        super(rev);
+    }
+
+    @Override
+    public long lastModified() throws IOException, InterruptedException {
+        return 0;
+    }
+
+    @NonNull
+    @Override
+    public SCMFile getRoot() {
+        return null;
+    }
+
+    @Extension
+    public static class TelescopeImpl extends GitSCMTelescope {
+
+        private static final int TEN_SECONDS_OF_MILLIS = 10000;
+
+        @Override
+        public boolean supports(@NonNull String remote) {
+            return ASFGitSCMNavigator.GIT_BOX.startsWith(remote) || ASFGitSCMNavigator.GIT_WIP.startsWith(remote);
+        }
+
+        @Override
+        public void validate(@NonNull String remote, StandardCredentials credentials)
+                throws IOException, InterruptedException {
+            // no-op because anonymous access
+        }
+
+        @Override
+        protected SCMFileSystem build(@NonNull String remote, StandardCredentials credentials, @NonNull SCMHead head,
+                                      SCMRevision rev) throws IOException, InterruptedException {
+            return new ASFGitSCMFileSystem(remote, head, rev);
+        }
+
+        @Override
+        public long getTimestamp(@NonNull String remote, StandardCredentials credentials, @NonNull String refOrHash)
+                throws IOException, InterruptedException {
+            String commitUrl = buildTemplateWithRemote("{+server}{?p}{;a,h}", remote)
+                    .set("a", "commit")
+                    .set("h", refOrHash)
+                    .expand();
+            Document doc = Jsoup.parse(new URL(commitUrl), TEN_SECONDS_OF_MILLIS);
+            Elements elements = doc.select("table.object_header tr td span.datetime");
+            try {
+                return new SimpleDateFormat(ASFGitSCMNavigator.RFC_2822).parse(elements.get(1).text()).getTime();
+            } catch (ParseException e) {
+                throw new IOException("Unexpected date format, expected RFC 2822, got " + elements.get(1).text());
+            } catch (IndexOutOfBoundsException e) {
+                throw new IOException("Unexpected response body, expecting two timestamps only got " + elements.size());
+            }
+        }
+
+        private UriTemplate buildTemplateWithRemote(String template, @NonNull String remote) throws IOException {
+            UriTemplate commitTemplate;
+            String server = null;
+            String p = null;
+            for (String s : new String[]{ASFGitSCMNavigator.GIT_WIP, ASFGitSCMNavigator.GIT_BOX}) {
+                if (remote.startsWith(s + "/")) {
+                    server = s;
+                    p = remote.substring(s.length() + 1);
+                    break;
+                }
+            }
+            if (server == null) {
+                throw new IOException("Unknown remote: " + remote);
+            }
+
+            commitTemplate = UriTemplate.fromTemplate(template);
+            commitTemplate.set("server", server).set("p", p);
+            return commitTemplate;
+        }
+
+        @Override
+        public SCMRevision getRevision(@NonNull String remote, StandardCredentials credentials,
+                                       @NonNull String refOrHash)
+                throws IOException, InterruptedException {
+            return null;
+        }
+
+        @Override
+        public Iterable<SCMRevision> getRevisions(@NonNull String remote, StandardCredentials credentials,
+                                                  @NonNull Set<ReferenceType> referenceTypes)
+                throws IOException, InterruptedException {
+            return null;
+        }
+
+        @Override
+        public String getDefaultTarget(@NonNull String remote, StandardCredentials credentials)
+                throws IOException, InterruptedException {
+            return null;
+        }
+    }
 }
diff --git a/src/main/java/org/apache/jenkins/gitpubsub/ASFGitSCMNavigator.java b/src/main/java/org/apache/jenkins/gitpubsub/ASFGitSCMNavigator.java
index e8b4841..1252efa 100644
--- a/src/main/java/org/apache/jenkins/gitpubsub/ASFGitSCMNavigator.java
+++ b/src/main/java/org/apache/jenkins/gitpubsub/ASFGitSCMNavigator.java
@@ -43,6 +43,9 @@
 
 public class ASFGitSCMNavigator extends SCMNavigator {
 
+    static final String RFC_2822 = "EEE, dd MMM yyyy HH:mm:ss Z";
+    static final String GIT_WIP = "https://git-wip-us.apache.org/repos/asf";
+    static final String GIT_BOX = "https://gitbox.apache.org/repos/asf";
     private final String server;
     private List<SCMTrait<?>> traits = new ArrayList<>();
 
@@ -122,6 +125,7 @@
 
     @Extension
     public static class DescriptorImpl extends SCMNavigatorDescriptor {
+
         @Nonnull
         @Override
         public String getDisplayName() {
@@ -130,13 +134,13 @@
 
         @Override
         public SCMNavigator newInstance(String name) {
-            return new ASFGitSCMNavigator("https://git-wip-us.apache.org/repos/asf");
+            return new ASFGitSCMNavigator(GIT_WIP);
         }
 
         public ListBoxModel doFillServerItems() {
             ListBoxModel result = new ListBoxModel();
-            result.add("Git WIP", "https://git-wip-us.apache.org/repos/asf");
-            result.add("Gitbox", "https://gitbox.apache.org/repos/asf");
+            result.add("Git WIP", GIT_WIP);
+            result.add("Gitbox", GIT_BOX);
             return result;
         }
 
diff --git a/src/test/java/org/apache/jenkins/gitpubsub/ASFGitSCMFileSystemTest.java b/src/test/java/org/apache/jenkins/gitpubsub/ASFGitSCMFileSystemTest.java
new file mode 100644
index 0000000..f5b6639
--- /dev/null
+++ b/src/test/java/org/apache/jenkins/gitpubsub/ASFGitSCMFileSystemTest.java
@@ -0,0 +1,18 @@
+package org.apache.jenkins.gitpubsub;
+
+import org.junit.Test;
+
+import static org.hamcrest.Matchers.is;
+import static org.junit.Assert.*;
+
+/**
+ * @author Stephen Connolly
+ */
+public class ASFGitSCMFileSystemTest {
+    @Test
+    public void smokeTestGetTimestamp() throws Exception {
+        long timestamp = new ASFGitSCMFileSystem.TelescopeImpl()
+                .getTimestamp("https://git-wip-us.apache.org/repos/asf/maven.git", null, "maven-3.5.0");
+        assertThat(timestamp, is(1491248130000L));
+    }
+}