Add a new quote() method which converts a date to a quoted string.

src/main/java/com/samskivert/jdbc/JDBCUtil.java

@@ -200,6 +200,19 @@ public class JDBCUtil
         }
     }
 
+    /**
+     * Converts the date to a string and surrounds it in single-quotes via the escape method. If the
+     * date is null, returns null.
+     */
+    public String quote (Date date)
+    {
+        if (date == null) {
+            return ;
+        }
+
+        return escape(String.valueOf(date));
+    } 
+
     /**
      * Escapes any single quotes in the supplied text and wraps it in single quotes to make it safe
      * for embedding into a database query.