获取某年某月的日期

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做财务系统经常会用到会计期间的计算，总结了一些！

    /**     * 得到某年某月的第一天     *      * @param year     * @param month     * @return     */

public static  String getFirstDayOfMonth(Integer year, Integer month) {        Calendar cal = Calendar.getInstance();        cal.set(Calendar.YEAR, year);        cal.set(Calendar.MONTH, month-1);        cal.set(Calendar.DAY_OF_MONTH, cal.getMinimum(Calendar.DATE));        return new SimpleDateFormat("yyyy-MM-dd").format(cal.getTime());       }

 /**     * 返回指定年月的最后一天     *     * @param year     * @param month     * @return     */    public static Date getLastDayOfMonth(Integer year, Integer month) {        Calendar calendar = Calendar.getInstance();        calendar.set(year, month,-1);        calendar.roll(Calendar.DAY_OF_MONTH, 1);        return calendar.getTime();    }

<pre name="code" class="java">  <pre name="code" class="java"> /**     * 返回指定年月的最后一天     *     * @param year     * @param month     * @return     */

  public static String getLastDayOfMonth(int year,int month)    {        Calendar cal = Calendar.getInstance();        //设置年份        cal.set(Calendar.YEAR,year);        //设置月份        cal.set(Calendar.MONTH, month-1);        //获取某月最大天数        int lastDay = cal.getActualMaximum(Calendar.DAY_OF_MONTH);        //设置日历中月份的最大天数        cal.set(Calendar.DAY_OF_MONTH, lastDay);        //格式化日期        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");        String lastDayOfMonth = sdf.format(cal.getTime());                 return lastDayOfMonth;    }

/**  * 比较两个日期之间的大小  *   * @param d1  * @param d2  * @return 前者大于后者返回true 反之false  */ public static boolean compareDate(Date d1, Date d2) {      Calendar c1 = Calendar.getInstance();      Calendar c2 = Calendar.getInstance();      c1.setTime(d1);      c2.setTime(d2);        int result = c1.compareTo(c2);      if (result >= 0)          return true;      else          return false;  }

public static String getFirstDate(){ //第一天的日期Calendar   ca   =   Calendar.getInstance();ca.setTime(new Date());                            //  someDate 为你要获取的那个月的时间ca.set(Calendar.DAY_OF_MONTH,   1);Date   firstDate   =   ca.getTime();return  getDateFormat(firstDate);}public static String getDateFormat(Date date) {//Date now = new Date();SimpleDateFormat sf = new SimpleDateFormat("yyyy-MM-dd");return sf.format(date);}

public static String getTimeFormat(Date date) {//带有时分秒的日期格式//Date now = new Date();SimpleDateFormat sf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");return sf.format(date);}public static Date StringToDate(String str){//字符串转换为日期格式if(str==null||str.trim().equals("")) return null;Date date = new Date();SimpleDateFormat sf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");try {date = sf.parse(str);} catch (ParseException e) {e.printStackTrace();date = null;}return date;}

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