DateUtil

package com.meiliwan.emall.commons.util;

import java.io.PrintStream;
import java.sql.Timestamp;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.concurrent.TimeUnit;

public class DateUtil
{
public static final String FORMAT_DATETIME = "yyyy-MM-dd HH:mm:ss";
public static final String FORMAT_DATE = "yyyy-MM-dd";
public static long SECOND_TIME = 1000L;
public static long MINUTE_TIME = 60L * SECOND_TIME;
public static long HOUR_TIME = 60L * MINUTE_TIME;
public static long DAY = 24L * HOUR_TIME;

private static final SimpleDateFormat MONTH_FORMAT = new SimpleDateFormat("yyyyMM");

private static final SimpleDateFormat TIME_IDENTITY_FORMAT = new SimpleDateFormat("yyyyMMddHHmmss");

public static final SimpleDateFormat DATETIME_FORMAT = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

public static String timeAdd(Date date, long diffTime, TimeUnit unit)
{
long resultTime = date.getTime() + unit.toMillis(diffTime);

return getDatetimeStr(resultTime);
}

public static String getIdentityTime()
{
return TIME_IDENTITY_FORMAT.format(new Date());
}

public static String getMonthStr(Date date)
{
return MONTH_FORMAT.format(date);
}

public static boolean isDate(String date) {
return date.matches("\\d{4}-\\d{2}-\\d{2}");
}
public static String getCurrentDateStr() {
return getCurrentDateStr("yyyy-MM-dd HH:mm:ss");
}
public static String getDatetimeStr(long datetime) {
return format(new Date(datetime), "yyyy-MM-dd HH:mm:ss");
}
public static String getDatetimeStr(Date datetime) {
return format(datetime, "yyyy-MM-dd HH:mm:ss");
}
public static String getDateStr(long datetime) {
return format(new Date(datetime), "yyyy-MM-dd");
}

public static Date getCurrentDate() {
Calendar cal = Calendar.getInstance();
Date currDate = cal.getTime();
return currDate;
}
public static Date datetimeStrToDate(String datetimeStr) {
Date datetime = null;
try {
datetime = DATETIME_FORMAT.parse(datetimeStr);
} catch (ParseException e) {
e.printStackTrace();
}
return datetime;
}

public static Timestamp getCurrentTimestamp() {
return new Timestamp(new Date().getTime());
}

public static Timestamp getTimestampByDate(Date date) {
return new Timestamp(date.getTime());
}

public static Date getDateByTimestamp(Timestamp timestamp) {
return new Date(timestamp.getTime());
}

public static Timestamp getTimestampByStringYYYYMMddHHmmss(String yyyyMMddHHmmss)
{
DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Date date = null;
try {
date = df.parse(yyyyMMddHHmmss);
} catch (ParseException e) {
e.printStackTrace();
return null;
}
return new Timestamp(date.getTime());
}

public static boolean isFixTimestamp(String yyyyMMddHHmmss)
{
DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Date date = null;
try {
date = df.parse(yyyyMMddHHmmss);
} catch (ParseException e) {
e.printStackTrace();
return false;
}
return true;
}

public static String getStringYYYYMMddHHmmssByTimestamp(Timestamp timestamp)
{
DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
return df.format(new Date(timestamp.getTime()));
}

public static boolean isPast(Timestamp start, Timestamp end)
{
if (ObjectUtils.isExistNullObj(new Object[] { start, end })) {
return true;
}
return end.getTime() - start.getTime() < 0L;
}

public static Date parseStringToDate(String date_str)
{
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Date date = null;
try {
date = sdf.parse(date_str);
} catch (ParseException e) {
e.printStackTrace();
}
return date;
}

public static Date parseStringToDate(String date_str, String format) {
SimpleDateFormat sdf = new SimpleDateFormat(format);
Date date = null;
try {
date = sdf.parse(date_str);
} catch (ParseException e) {
e.printStackTrace();
}
return date;
}

public static String parseLoadTime(long beginTime) {
long during = System.currentTimeMillis() - beginTime;
if (during < SECOND_TIME) return during + " millis";

String loadTimeString = "";
long minutes = during / MINUTE_TIME;
long seconds = during / SECOND_TIME;

if (minutes > 0L) loadTimeString = loadTimeString + minutes + "minutes ";
if (seconds > 0L) loadTimeString = loadTimeString + seconds + "seconds ";

return loadTimeString = loadTimeString + during % SECOND_TIME + "millis";
}

private static String getCurrentDateStr(String strFormat) {
Calendar cal = Calendar.getInstance();
Date currDate = cal.getTime();
return format(currDate, strFormat);
}

private static String format(Date aTs_Datetime, String as_Pattern) {
if ((aTs_Datetime == null) || (as_Pattern == null)) {
return null;
}
SimpleDateFormat dateFromat = new SimpleDateFormat(as_Pattern);
return dateFromat.format(aTs_Datetime);
}

public static int todayNowTime()
{
Calendar today = Calendar.getInstance();
today.setTimeInMillis(System.currentTimeMillis());
int hour = today.get(11);
int minute = today.get(12);
int second = today.get(13);
today.set(11, 0);
today.set(12, 0);
today.set(13, 0);
long beginTime = today.getTimeInMillis() / 1000L;
today.set(11, hour);
today.set(12, minute);
today.set(13, second);
long endTime = today.getTimeInMillis() / 1000L;
return (int)(endTime - beginTime + 1L);
}

public static void main(String[] args)
{
System.out.println(getCurrentDateStr());
System.out.println(getDatetimeStr(System.currentTimeMillis()));
System.out.println(getCurrentDateStr("yyyy.MM.dd HH:mm:ss"));
System.out.println(format(new Date(System.currentTimeMillis()), "yyyy.MM.dd HH:mm:ss"));
}
}