java之获取时间

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     一：获取当前时间，一小时前，一小时后，一月前，一月后的时间       GregorianCalendar a = new GregorianCalendar();      SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");      System.out.println("当前时间："+format.format(a.getTime()));      a.add(Calendar.HOUR_OF_DAY, -1);      System.out.println("一小时前："+format.format(a.getTime()));      a = new GregorianCalendar();      a.add(Calendar.DAY_OF_MONTH, -1);      System.out.println("一 天 前："+format.format(a.getTime()));       a = new GregorianCalendar();      a.add(Calendar.MONTH, -1);      System.out.println("一 月 前："+format.format(a.getTime()));     a = new GregorianCalendar();     a.add(Calendar.MONTH, 1);     System.out.println("一 月 后："+format.format(a.getTime()));     a = new GregorianCalendar();     a.add(Calendar.HOUR_OF_DAY,5);     System.out.print("5 小 时 后："+format.format(a.getTime()));

  二 ：获取当前月最大天数    Calendar cal = Calendar.getInstance();  int day=cal.getActualMaximum(Calendar.DAY_OF_MONTH);  System.out.println(“当前月最大天数：”+day);

  三：格式化日期    public static Date parseDate(String dateStr, String format) {Date date = null;try {SimpleDateFormat format2 = new SimpleDateFormat(format);date = format2.parse(dateStr);} catch (Exception e) {}return date;}

  四：date转String    public static String format(Date date, String format) {String result = "";try {if (date != null) {SimpleDateFormat dateFormat = new SimpleDateFormat(format);result = dateFormat.format(date);}} catch (Exception e) {}return result;}

  五：返回这个时间是本年第多少周    public static int getYearOfWeek(Date date) {Calendar calendar = Calendar.getInstance();calendar.setTime(date);return calendar.get(Calendar.WEEK_OF_YEAR);}

  六：判断两个日期是不是一个周  public static boolean weekOfYeak(Date date1, Date date2) {String dates1 = getMondayOfThisWeek(date1);String dates2 = getMondayOfThisWeek(date2);if (dates1.equals(dates2)) {return true;}return false;}

  七：返回这个时间是本年第多少天  public static int getYearOfDay(Date date) {Calendar calendar = Calendar.getInstance();calendar.setTime(date);return calendar.get(Calendar.DAY_OF_YEAR);}

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