code: public static FastDateFormat getDateInstance(final int style, final TimeZone timeZone) {
  		return cache.getDateInstance(style, timeZone, null);
  	}
docs: 获得 {@link FastDateFormat} 实例<br>
  支持缓存
  
  @param style date style: FULL, LONG, MEDIUM, or SHORT
  @param timeZone 时区{@link TimeZone}
  @return 本地化 {@link FastDateFormat}