Rien de bien révolutionnaire, mais c’est un bon point de départ pour apprendre à créer un plugin pour TeamCity. Voici le fichier DateBuildNumber.java

package com.sncf.gl.apps.teamcity.plugins.datebuilnnumber;

import java.text.SimpleDateFormat;
import java.util.Date;

import jetbrains.buildServer.serverSide.BuildServerAdapter;
import jetbrains.buildServer.serverSide.SBuildServer;
import jetbrains.buildServer.serverSide.SRunningBuild;

import com.intellij.openapi.diagnostic.Logger;

public class DateBuildNumber extends BuildServerAdapter
{
   private final static Logger LOG = Logger.getInstance(DateBuildNumber.class.getName());

   private static final String DATE = "{date}"; 

   // Constructor
   public DateBuildNumber(SBuildServer aBuildServer)
   {
       System.out.println( "### DateBuildNumber adding listener=" + this );
       LOG.info("### DateBuildNumber adding listener=" + this);

       // Register with TC
       aBuildServer.addListener(this);
   }

   public void buildStarted(SRunningBuild build)
   {
       String buildNumber = build.getBuildNumber();

       // Logging in "teamcity_install_dir\logs\stdout_XXXX.log"
       System.out.println("### DateBuildNumber plugin : buildStarted");
       LOG.info("### DateBuildNumber plugin : buildStarted");

       // If the build number contains the DATE = "{date}"
       // pattern we replace it by the current date.
       if(buildNumber.lastIndexOf(DATE) > -1)
       {
           build.setBuildNumber(buildNumber.replace(DATE, createBuildNumber()));
       }
       else
       {
           System.out.println("### DateBuildNumber plugin, no {date} pattern found");
           LOG.info("### DateBuildNumber plugin, no {date} pattern found");
       }
   }

   public String createBuildNumber()
   {
       Date currentBuild = new Date();
       // Here you can modify the date format
       // Please refer to the javaDoc :
       // http://java.sun.com/j2se/1.5.0/docs/api/java/text/SimpleDateFormat.html
       SimpleDateFormat sdf = new SimpleDateFormat("dd.MM.yy-HH'h'mm");
       return sdf.format(currentBuild);
   }
}

Et voici le fichier build-server-plugin.xml :

Enfin voici une version packagée de ce plugin (pour TeamCity 4.xx) :  datePlugin.jar

Pour aller plus loin : Developing TeamCity plugins