Java时间类型非常的差，首先版本问题，本人使用java在Android平台开发。很多Data类的方法已经不提倡使用，一个时间，居然要使用Calendar、DateFormat等类共同编码，非常麻烦。而且很多支持不足，比如时间加减，比如获取时间的日期而时分秒置0等，而C#的时间类实现的就非常方便。

public class DateUtil {    public static Date getDate(Date date){        Date dt = null;        Calendar calendar = Calendar.getInstance();        calendar.setTime(date);        calendar.set(Calendar.HOUR_OF_DAY,   0);           calendar.set(Calendar.MINUTE,   0);           calendar.set(Calendar.SECOND,   0);           calendar.set(Calendar.MILLISECOND,   0);        calendar.add(Calendar.DAY_OF_MONTH, 1);        dt = calendar.getTime();        return dt;    }        public static String getDateString(Date date){        String sDate = "";        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");        Date dt = getDate(date);        sDate = sdf.format(dt);                return sDate;    }        public static long getDateLong(Date date){        long lDate = 0;        Date dt = getDate(date);        lDate = dt.getTime();        return lDate;    }        public static long getDateTimeLong(Date date){        long lDate = 0;        lDate = date.getTime();        return lDate;    }        public static String getString(Date date, String format){        String sDate ="";        SimpleDateFormat sdf = new SimpleDateFormat(format);        sDate = sdf.format(date);        return sDate;    }        public static long getString(String dateTime, String format){        long lDate = 0;                SimpleDateFormat sdf = new SimpleDateFormat(format);        try {            Date date = sdf.parse(dateTime);            lDate = date.getTime();        } catch (ParseException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }                return lDate;    }        public static String getString(long tm, String format){        String sDate="";        Date date = DateUtil.putDateTime(tm);        SimpleDateFormat sdf = new SimpleDateFormat(format);        sDate = sdf.format(date);        return sDate;    }        public static Date putDateTime(long time){        Date date = null;        date = new Date(time);        return date;    }        public static Date putDate(long time){        Date date = null;        date = new Date(time);        date = getDate(date);        return date;    }    public static Date putDateTime(String dtString, String format){        Date date = null;        SimpleDateFormat sdf = new SimpleDateFormat(format);        try {            date = sdf.parse(dtString);        } catch (ParseException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }        return date;    }    public static Date AddYear(Date date, int y){        Date dt = null;        Calendar calendar = Calendar.getInstance();        calendar.setTime(date);        calendar.add(Calendar.YEAR, y);        dt = calendar.getTime();        return dt;    }    public static Date AddMonth(Date date, int m){        Date dt = null;        Calendar calendar = Calendar.getInstance();        calendar.setTime(date);        calendar.add(Calendar.MONTH, m);        dt = calendar.getTime();        return dt;    }    public static Date AddDay(Date date, int d){        Date dt = null;        Calendar calendar = Calendar.getInstance();        calendar.setTime(date);        calendar.add(Calendar.DAY_OF_MONTH, d);        dt = calendar.getTime();        return dt;    }    public static Date AddHour(Date date, int h){        Date dt = null;        Calendar calendar = Calendar.getInstance();        calendar.setTime(date);        calendar.add(Calendar.HOUR_OF_DAY, h);        dt = calendar.getTime();        return dt;    }    public static Date AddMinute(Date date, int m){        Date dt = null;        Calendar calendar = Calendar.getInstance();        calendar.setTime(date);        calendar.add(Calendar.MINUTE, m);        dt = calendar.getTime();        return dt;    }    public static Date AddSecond(Date date, int s){        Date dt = null;        Calendar calendar = Calendar.getInstance();        calendar.setTime(date);        calendar.add(Calendar.SECOND, s);        dt = calendar.getTime();        return dt;    }        public static Date Add(Date date, int millisecond){        Date dt = null;        Calendar calendar = Calendar.getInstance();        calendar.setTime(date);        calendar.add(Calendar.MILLISECOND, millisecond);        dt = calendar.getTime();        return dt;    }    public static long Subtrat(Date date1, Date date2){        long l = 0;        l = date1.getTime() - date2.getTime();        return l;    }}