DateUtil

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import java.sql.Timestamp;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Date;public class DateUtil {    private static final String dateFormat = "yyyy-MM-dd";    public static final long oneDay = 86400000L;    public DateUtil() {    }    public static Date formatToDate(String dateStr, String format) {        Date date = null;        try {            if(!StringUtil.isEmpty(dateStr)) {                date = (new SimpleDateFormat(format)).parse(dateStr);            }        } catch (ParseException var4) {            var4.printStackTrace();        }        return date;    }    public static String formatTimeStampToString(Timestamp date, String format) {        if(date == null) {            return "";        } else {            SimpleDateFormat df = new SimpleDateFormat(format);            String str = df.format(date);            return str;        }    }    public static Timestamp getCurrentTimeStampYMD() {        SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd 00:00:00");        String time = df.format(new Date());        Timestamp ts = Timestamp.valueOf(time);        return ts;    }    public static Timestamp formatToTimestamp(String date, String format) {        Timestamp timestamp = null;        try {            if(date != null && date.length() > 0) {                Date e = (new SimpleDateFormat(format)).parse(date);                timestamp = new Timestamp(e.getTime());            }        } catch (ParseException var4) {            var4.printStackTrace();        }        return timestamp;    }    public static String formatToDayStr(Date date) {        return formatToStr(date, "yyyy-MM-dd");    }    public static String formatToStr(Date date, String format) {        String dateStr = null;        if(date != null) {            dateStr = (new SimpleDateFormat(format)).format(date);        }        return dateStr;    }    public static String formatToStr(Timestamp date, String format) {        String dateStr = null;        if(date != null) {            dateStr = (new SimpleDateFormat(format)).format(date);        }        return dateStr;    }    public static int dateDiff(Date begin, Date end) {        return (int)((getDayBegin(end).getTime() - getDayBegin(begin).getTime()) / 86400000L);    }    public static Date getDayBegin(Date day) {        Calendar c = Calendar.getInstance();        c.setTimeInMillis(day.getTime());        c.set(14, 0);        c.set(13, 0);        c.set(12, 0);        c.set(11, 0);        return c.getTime();    }    public static long dateDiff(String startTime, String endTime, String format) throws ParseException {        SimpleDateFormat sd = new SimpleDateFormat(format);        long nd = 86400000L;        long nh = 3600000L;        long nm = 60000L;        long ns = 1000L;        long diff = sd.parse(endTime).getTime() - sd.parse(startTime).getTime();        long day = diff / nd;        long hour = diff % nd / nh;        long min = diff % nd % nh / nm;        long sec = diff % nd % nh % nm / ns;        System.out.println("时间相差：" + day + "天" + hour + "小时" + min + "分钟" + sec + "秒。");        return day;    }    public static String getStrFromDate(Date date) {        return getStrFormDate(date, "yyyy-MM-dd");    }    public static String getStrFormDate(Date date, String format) {        SimpleDateFormat sdf = new SimpleDateFormat(format);        String str = sdf.format(date);        return str;    }    public static Date getSpecifiedDay(Date date, int t) {        if(date == null) {            return null;        } else {            Calendar c = Calendar.getInstance();            c.setTime(date);            c.add(5, t);            return c.getTime();        }    }    public static Date getSpecifiedDayStart(Date date, int t) {        if(date == null) {            return null;        } else {            Calendar c = Calendar.getInstance();            c.setTime(date);            c.add(5, t);            c.set(11, 0);            c.set(12, 0);            c.set(13, 0);            c.set(14, 0);            return c.getTime();        }    }    public static Date getSpecifiedDayEnd(Date date, int t) {        if(date == null) {            return null;        } else {            Calendar c = Calendar.getInstance();            c.setTime(date);            c.add(5, t);            c.set(11, 23);            c.set(12, 29);            c.set(13, 29);            c.set(14, 999);            return c.getTime();        }    }    public static void main(String[] args) throws ParseException {        System.out.println(getSpecifiedDayStart(new Date(), 1));    }}
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