时间工具类

public class DateUtil {

    public static Date strToDate(String dateStr) {
        try {
            if (dateStr.contains("-") && !dateStr.contains("T")){
                SimpleDateFormat format = new SimpleDateFormat("yyyy-HH-dd HH:mm:ss");
                Calendar calendar = Calendar.getInstance();
                calendar.setTime(format.parse(dateStr));
                calendar.set(Calendar.SECOND, calendar.get(Calendar.SECOND) + 1);
                return calendar.getTime();
            }else if (dateStr.contains("-") &&dateStr.contains("T")){
                SimpleDateFormat format = new SimpleDateFormat("yyyy-HH-dd'T'HH:mm:ss");
                format.parse(dateStr);
            } else {
                SimpleDateFormat format = new SimpleDateFormat("yyyyHHdd");
                return format.parse(dateStr);
            }
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return null;
    }

    public static String addDate(Date date,int n){
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        calendar.add(Calendar.DATE, n);

        return formatDate(calendar.getTime());
    }

    public static String formatDate(Date date) {
        return formatDateByFormat(date, "yyyy-MM-dd");
    }

    public static String formatDateByFormat(Date date, String format) {
        String result = "";
        if (date != null) {
            try {
                SimpleDateFormat sdf = new SimpleDateFormat(format);
                result = sdf.format(date);
            } catch (Exception ex) {
            }
        }
        return result;
    }

}