1、错误叙述性说明

Exception in thread "main" java.lang.IllegalArgumentException: Cannot format given Object as a Date	at java.text.DateFormat.format(DateFormat.java:301)	at java.text.Format.format(Format.java:157)	at com.you.util.DateBefore.getMonthBefore(DateBefore.java:24)	at com.you.util.DateBefore.main(DateBefore.java:33)

2、错误原因

/** *  */package com.you.util;import java.text.SimpleDateFormat;import java.util.Calendar;/** * @author YouHaidong * */public class DateBefore {	/**	 * 	 * @return	 */	public static String getMonthBefore(String subStr)	{		Calendar calendar = Calendar.getInstance(); 		calendar.add(Calendar.MONTH, -12);		SimpleDateFormat sdf = new SimpleDateFormat("yyyyMM");		subStr = sdf.format(calendar);		return subStr;	}	/**	 * @param args	 */	public static void main(String[] args) 	{		String date = getMonthBefore("2014-02");		System.out.println(date);	}}

日期格式转化异常

3、解决的方法

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