Enable the console show version command and the viewer about command, to show the last git commit hash together with the conmit date and time. The data is retrieved form a file bin/.version This file can be generated automatically using the post commit script by adding the following to the script:

git log -n 1 --pretty="format:%h: %ci" > bin/.version

This command can also be run manually to create the bin/.version file.

This command genrates a short form of the commit hash and a date and time of the commit in ISO8601 format.
If a full commit hash is required then change %h to %H

The logic that is used to extract the deprecated svn revision is still included.
It will be removed at a future date

.gitignore

@@ -43,3 +43,4 @@ OpenSim/OpenSim.usertasks
 TAGS
 *~
 Makefile.local
+bin/.version

OpenSim/Framework/Servers/BaseOpenSimServer.cs

@@ -76,7 +76,7 @@ namespace OpenSim.Framework.Servers
         protected string m_startupDirectory = Environment.CurrentDirectory;
 
         /// <summary>
-        /// Server version information.  Usually VersionInfo + information about svn revision, operating system, etc.
+        /// Server version information.  Usually VersionInfo + information about git commit, operating system, etc.
         /// </summary>
         protected string m_version;
 
@@ -422,6 +422,16 @@ namespace OpenSim.Framework.Servers
         {
             string buildVersion = string.Empty;
 
+            // Add commit hash and date information if available
+            // The commit hash and date are stored in a file bin/.version
+            // This file can automatically created by a post
+            // commit script in the opensim git master repository or
+            // by issuing the follwoing command from the top level
+            // directory of the opensim repository
+            // git log -n 1 --pretty="format:%h: %ci" >bin/.version
+            // For the full git commit hash use %H instead of %h
+            //
+            // The subversion information is deprecated and will be removed at a later date
             // Add subversion revision information if available
             // Try file "svn_revision" in the current directory first, then the .svn info.
             // This allows to make the revision available in simulators not running from the source tree.
@@ -429,15 +439,28 @@ namespace OpenSim.Framework.Servers
             // elsewhere as well
             string svnRevisionFileName = "svn_revision";
             string svnFileName = ".svn/entries";
+            string gitCommitFileName = ".version";
             string inputLine;
             int strcmp;
 
+            if (File.Exists( gitCommitFileName))
+            {
+                StreamReader CommitFile = File.OpenText(gitCommitFileName);
+                buildVersion = Environment.NewLine + "git# " + CommitFile.ReadLine();
+                CommitFile.Close();
+                m_version += buildVersion ?? "";
+            }
+
+            // Remove the else logic when subversion mirror is no longer used
+            else
+            {
                 if (File.Exists(svnRevisionFileName))
                 {
                     StreamReader RevisionFile = File.OpenText(svnRevisionFileName);
                     buildVersion = RevisionFile.ReadLine();
                     buildVersion.Trim();
                     RevisionFile.Close();
+
                 }
 
                 if (string.IsNullOrEmpty(buildVersion) && File.Exists(svnFileName))
@@ -463,6 +486,7 @@ namespace OpenSim.Framework.Servers
 
                 m_version += string.IsNullOrEmpty(buildVersion) ? "      " : ("." + buildVersion + "     ").Substring(0, 6);
             }
+        }
         
         protected void CreatePIDFile(string path)
         {