JAVA对时间的几个处理小方法

private static int daysBetween(Date date1, Date date2) {
Calendar cal = Calendar.getInstance();
cal.setTime(date1);
long time1 = cal.getTimeInMillis();
cal.setTime(date2);
long time2 = cal.getTimeInMillis();
long between_days = (time2 - time1) / (1000 * 3600 * 24);

return Integer.parseInt(String.valueOf(between_days)) + 1;
}

private static Date getnextDay(final Date date) {
Calendar c = Calendar.getInstance();
c.setTime(date);
c.set(Calendar.DATE, c.get(Calendar.DATE) + 1);
c.set(Calendar.HOUR_OF_DAY, 0);
c.set(Calendar.MINUTE, 0);
c.set(Calendar.SECOND, 0);
c.set(Calendar.MILLISECOND, 0);
return c.getTime();
}

private int getDayOfWeek(Date date) {
Calendar cal = Calendar.getInstance();
cal.setTime(date);
long whichDay1 = cal.get(Calendar.DAY_OF_WEEK);
return Integer.parseInt(String.valueOf(whichDay1)) - 1;
}

String[] weeks = new String[] { "星期日", "星期一", "星期二", "星期三", "星期四",
"星期五", "星期六" };