tweaked migration date for last time.

laravel/cli/tasks/migrate/migrator.php

@@ -192,7 +192,7 @@ public function make($arguments = array())
 		// is a better way of ordering migrations than a simple integer
 		// incrementation, since developers may start working on the
 		// next migration at the same time unknowingly.
-		$prefix = date('Y_m_d').'_'.time();
+		$prefix = date('Y_m_d_His');
 
 		$path = Bundle::path($bundle).'migrations'.DS;
 

laravel/cli/tasks/migrate/resolver.php

@@ -116,7 +116,7 @@ protected function resolve($migrations)
 			// naming collisions with other bundle's migrations.
 			$prefix = Bundle::class_prefix($bundle);
 
-			$class = $prefix.substr($name, 22);
+			$class = $prefix.substr($name, 18);
 
 			$migration = new $class;