Java gets a summary of various ways to Date time
- 2020-04-01 04:31:28
- OfStack
The various ways Java can get Date time are Shared below
Common time acquisition methods
public class DateUtils {
@Test
public void getTimeStamp() {
Date date = new Date();
long times = date.getTime();
System.out.println(times);
//The second method:
new Date().getTime();
}
@Test
public void getFormatDate(){
Date date = new Date();
long times = date.getTime();//The time stamp
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String dateString = formatter.format(date);
System.out.println(dateString);
}
@Test
public void timestampToDate(){
long times = 1412654676572L;
Date date = new Date(times);
System.out.println(date);
}
}
Other ways to get time
package com.qunar.date;
import java.text.ParseException;
import java.text.ParsePosition;
import java.text.SimpleDateFormat;
import java.util.*;
/**
* Created by liugen.xu on 2015/8/4.
*/
public class DateGenerate {
public static Date getNowDate() {
Date currentTime = new Date();
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String dateString = formatter.format(currentTime);
ParsePosition pos = new ParsePosition(8);
Date currentTime_2 = formatter.parse(dateString, pos);
return currentTime_2;
}
public static Date getNowDateShort() {
Date currentTime = new Date();
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
String dateString = formatter.format(currentTime);
ParsePosition pos = new ParsePosition(8);
Date currentTime_2 = formatter.parse(dateString, pos);
return currentTime_2;
}
public static String getStringDate() {
Date currentTime = new Date();
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String dateString = formatter.format(currentTime);
return dateString;
}
public static String getStringDateShort() {
Date currentTime = new Date();
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
String dateString = formatter.format(currentTime);
return dateString;
}
public static String getTimeShort() {
SimpleDateFormat formatter = new SimpleDateFormat("HH:mm:ss");
Date currentTime = new Date();
String dateString = formatter.format(currentTime);
return dateString;
}
public static Date strToDateLong(String strDate) {
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
ParsePosition pos = new ParsePosition(0);
Date strtodate = formatter.parse(strDate, pos);
return strtodate;
}
public static String dateToStrLong(java.util.Date dateDate) {
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String dateString = formatter.format(dateDate);
return dateString;
}
public static String dateToStr(java.util.Date dateDate) {
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
String dateString = formatter.format(dateDate);
return dateString;
}
public static Date strToDate(String strDate) {
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
ParsePosition pos = new ParsePosition(0);
Date strtodate = formatter.parse(strDate, pos);
return strtodate;
}
public static Date getNow() {
Date currentTime = new Date();
return currentTime;
}
public static Date getLastDate(long day) {
Date date = new Date();
long date_3_hm = date.getTime() - 3600000 * 34 * day;
Date date_3_hm_date = new Date(date_3_hm);
return date_3_hm_date;
}
public static String getStringToday() {
Date currentTime = new Date();
SimpleDateFormat formatter = new SimpleDateFormat("yyyyMMdd HHmmss");
String dateString = formatter.format(currentTime);
return dateString;
}
public static String getHour() {
Date currentTime = new Date();
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String dateString = formatter.format(currentTime);
String hour;
hour = dateString.substring(11, 13);
return hour;
}
public static String getTime() {
Date currentTime = new Date();
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String dateString = formatter.format(currentTime);
String min;
min = dateString.substring(14, 16);
return min;
}
public static String getUserDate(String sformat) {
Date currentTime = new Date();
SimpleDateFormat formatter = new SimpleDateFormat(sformat);
String dateString = formatter.format(currentTime);
return dateString;
}
public static String getTwoHour(String st1, String st2) {
String[] kk = null;
String[] jj = null;
kk = st1.split(":");
jj = st2.split(":");
if (Integer.parseInt(kk[0]) < Integer.parseInt(jj[0]))
return "0";
else {
double y = Double.parseDouble(kk[0]) + Double.parseDouble(kk[1]) / 60;
double u = Double.parseDouble(jj[0]) + Double.parseDouble(jj[1]) / 60;
if ((y - u) > 0)
return y - u + "";
else
return "0";
}
}
public static String getTwoDay(String sj1, String sj2) {
SimpleDateFormat myFormatter = new SimpleDateFormat("yyyy-MM-dd");
long day = 0;
try {
java.util.Date date = myFormatter.parse(sj1);
java.util.Date mydate = myFormatter.parse(sj2);
day = (date.getTime() - mydate.getTime()) / (24 * 60 * 60 * 1000);
} catch (Exception e) {
return "";
}
return day + "";
}
public static String getPreTime(String sj1, String jj) {
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String mydate1 = "";
try {
Date date1 = format.parse(sj1);
long Time = (date1.getTime() / 1000) + Integer.parseInt(jj) * 60;
date1.setTime(Time * 1000);
mydate1 = format.format(date1);
} catch (Exception e) {
}
return mydate1;
}
public static String getNextDay(String nowdate, String delay) {
try {
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
String mdate = "";
Date d = strToDate(nowdate);
long myTime = (d.getTime() / 1000) + Integer.parseInt(delay) * 24 * 60 * 60;
d.setTime(myTime * 1000);
mdate = format.format(d);
return mdate;
} catch (Exception e) {
return "";
}
}
public static boolean isLeapYear(String ddate) {
Date d = strToDate(ddate);
GregorianCalendar gc = (GregorianCalendar) Calendar.getInstance();
gc.setTime(d);
int year = gc.get(Calendar.YEAR);
if ((year % 400) == 0)
return true;
else if ((year % 4) == 0) {
if ((year % 100) == 0)
return false;
else
return true;
} else
return false;
}
public static String getEDate(String str) {
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
ParsePosition pos = new ParsePosition(0);
Date strtodate = formatter.parse(str, pos);
String j = strtodate.toString();
String[] k = j.split(" ");
return k[2] + k[1].toUpperCase() + k[5].substring(2, 4);
}
public static String getEndDateOfMonth(String dat) {// yyyy-MM-dd
String str = dat.substring(0, 8);
String month = dat.substring(5, 7);
int mon = Integer.parseInt(month);
if (mon == 1 || mon == 3 || mon == 5 || mon == 7 || mon == 8 || mon == 10 || mon == 12) {
str += "31";
} else if (mon == 4 || mon == 6 || mon == 9 || mon == 11) {
str += "30";
} else {
if (isLeapYear(dat)) {
str += "29";
} else {
str += "28";
}
}
return str;
}
public static boolean isSameWeekDates(Date date1, Date date2) {
Calendar cal1 = Calendar.getInstance();
Calendar cal2 = Calendar.getInstance();
cal1.setTime(date1);
cal2.setTime(date2);
int subYear = cal1.get(Calendar.YEAR) - cal2.get(Calendar.YEAR);
if (0 == subYear) {
if (cal1.get(Calendar.WEEK_OF_YEAR) == cal2.get(Calendar.WEEK_OF_YEAR))
return true;
} else if (1 == subYear && 11 == cal2.get(Calendar.MONTH)) {
//If the last week of December spans the first week of the coming year then the last week is counted as the first week of the coming year
if (cal1.get(Calendar.WEEK_OF_YEAR) == cal2.get(Calendar.WEEK_OF_YEAR))
return true;
} else if (-1 == subYear && 11 == cal1.get(Calendar.MONTH)) {
if (cal1.get(Calendar.WEEK_OF_YEAR) == cal2.get(Calendar.WEEK_OF_YEAR))
return true;
}
return false;
}
public static String getSeqWeek() {
Calendar c = Calendar.getInstance(Locale.CHINA);
String week = Integer.toString(c.get(Calendar.WEEK_OF_YEAR));
if (week.length() == 1)
week = "0" + week;
String year = Integer.toString(c.get(Calendar.YEAR));
return year + week;
}
public static String getWeek(String sdate, String num) {
//And then convert to time
Date dd = DateGenerate.strToDate(sdate);
Calendar c = Calendar.getInstance();
c.setTime(dd);
if (num.equals("1")) //Returns the date of Monday
c.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
else if (num.equals("2")) //Returns the date of Tuesday
c.set(Calendar.DAY_OF_WEEK, Calendar.TUESDAY);
else if (num.equals("3")) //Returns the date of Wednesday
c.set(Calendar.DAY_OF_WEEK, Calendar.WEDNESDAY);
else if (num.equals("4")) //Returns the date of Thursday
c.set(Calendar.DAY_OF_WEEK, Calendar.THURSDAY);
else if (num.equals("5")) //Returns the date of the Friday
c.set(Calendar.DAY_OF_WEEK, Calendar.FRIDAY);
else if (num.equals("6")) //Return to the date of Saturday
c.set(Calendar.DAY_OF_WEEK, Calendar.SATURDAY);
else if (num.equals("0")) //Returns the date of Sunday
c.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY);
return new SimpleDateFormat("yyyy-MM-dd").format(c.getTime());
}
public static String getWeek(String sdate) {
//And then convert to time
Date date = DateGenerate.strToDate(sdate);
Calendar c = Calendar.getInstance();
c.setTime(date);
// int hour=c.get(Calendar.DAY_OF_WEEK);
//The day of the week is stored in "hour", which ranges from 1 to 7
//1= Sunday 7= Saturday, and so on
return new SimpleDateFormat("EEEE").format(c.getTime());
}
public static String getWeekStr(String sdate) {
String str = "";
str = DateGenerate.getWeek(sdate);
if ("1".equals(str)) {
str = " Sunday ";
} else if ("2".equals(str)) {
str = " Monday ";
} else if ("3".equals(str)) {
str = " Tuesday ";
} else if ("4".equals(str)) {
str = " Wednesday ";
} else if ("5".equals(str)) {
str = " Thursday ";
} else if ("6".equals(str)) {
str = " Friday ";
} else if ("7".equals(str)) {
str = " Saturday ";
}
return str;
}
public static long getDays(String date1, String date2) {
if (date1 == null || date1.equals(""))
return 0;
if (date2 == null || date2.equals(""))
return 0;
//Convert to standard time
SimpleDateFormat myFormatter = new SimpleDateFormat("yyyy-MM-dd");
java.util.Date date = null;
java.util.Date mydate = null;
try {
date = myFormatter.parse(date1);
mydate = myFormatter.parse(date2);
} catch (Exception e) {
}
long day = (date.getTime() - mydate.getTime()) / (24 * 60 * 60 * 1000);
return day;
}
public static String getNowMonth(String sdate) {
//Take the day of the month
sdate = sdate.substring(0, 8) + "01";
//The first day of the month is the day of the week
Date date = DateGenerate.strToDate(sdate);
Calendar c = Calendar.getInstance();
c.setTime(date);
int u = c.get(Calendar.DAY_OF_WEEK);
String newday = DateGenerate.getNextDay(sdate, (1 - u) + "");
return newday;
}
public static String getNo(int k) {
return getUserDate("yyyyMMddhhmmss") + getRandom(k);
}
public static String getRandom(int i) {
Random jjj = new Random();
// int suiJiShu = jjj.nextInt(9);
if (i == 0)
return "";
String jj = "";
for (int k = 0; k < i; k++) {
jj = jj + jjj.nextInt(9);
}
return jj;
}
public static boolean RightDate(String date) {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
;
if (date == null)
return false;
if (date.length() > 10) {
sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
} else {
sdf = new SimpleDateFormat("yyyy-MM-dd");
}
try {
sdf.parse(date);
} catch (ParseException pe) {
return false;
}
return true;
}
/**
* ************************************************************************
* //nd=1 Indicates that the value returned contains the year //yf=1 Indicates that the returned value contains the month //rq=1 Indicates that the returned value contains the date //format Represents the format of the return 1
* Return in Chinese 2 With horizontal - return // 3 In order to slash / return 4 Returns an abbreviation with no other symbol // 5 With the dot . return
* ************************************************************************
*/
public static String getStringDateMonth(String sdate, String nd, String yf, String rq, String format) {
Date currentTime = new Date();
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
String dateString = formatter.format(currentTime);
String s_nd = dateString.substring(0, 4); //year
String s_yf = dateString.substring(5, 7); //in
String s_rq = dateString.substring(8, 10); //The date of
String sreturn = "";
roc.util.MyChar mc = new roc.util.MyChar();
if (sdate == null || sdate.equals("") || !mc.Isdate(sdate)) { //Handle null cases
if (nd.equals("1")) {
sreturn = s_nd;
//Processing spacer
if (format.equals("1"))
sreturn = sreturn + " years ";
else if (format.equals("2"))
sreturn = sreturn + "-";
else if (format.equals("3"))
sreturn = sreturn + "/";
else if (format.equals("5"))
sreturn = sreturn + ".";
}
//In dealing with
if (yf.equals("1")) {
sreturn = sreturn + s_yf;
if (format.equals("1"))
sreturn = sreturn + " month ";
else if (format.equals("2"))
sreturn = sreturn + "-";
else if (format.equals("3"))
sreturn = sreturn + "/";
else if (format.equals("5"))
sreturn = sreturn + ".";
}
//Processing date
if (rq.equals("1")) {
sreturn = sreturn + s_rq;
if (format.equals("1"))
sreturn = sreturn + " day ";
}
} else {
//It is not a null value and is a valid date value, which is first converted to a standard time format
sdate = roc.util.RocDate.getOKDate(sdate);
s_nd = sdate.substring(0, 4); //year
s_yf = sdate.substring(5, 7); //in
s_rq = sdate.substring(8, 10); //The date of
if (nd.equals("1")) {
sreturn = s_nd;
//Processing spacer
if (format.equals("1"))
sreturn = sreturn + " years ";
else if (format.equals("2"))
sreturn = sreturn + "-";
else if (format.equals("3"))
sreturn = sreturn + "/";
else if (format.equals("5"))
sreturn = sreturn + ".";
}
//In dealing with
if (yf.equals("1")) {
sreturn = sreturn + s_yf;
if (format.equals("1"))
sreturn = sreturn + " month ";
else if (format.equals("2"))
sreturn = sreturn + "-";
else if (format.equals("3"))
sreturn = sreturn + "/";
else if (format.equals("5"))
sreturn = sreturn + ".";
}
//Processing date
if (rq.equals("1")) {
sreturn = sreturn + s_rq;
if (format.equals("1"))
sreturn = sreturn + " day ";
}
}
return sreturn;
}
public static String getNextMonthDay(String sdate, int m) {
sdate = getOKDate(sdate);
int year = Integer.parseInt(sdate.substring(0, 4));
int month = Integer.parseInt(sdate.substring(5, 7));
month = month + m;
if (month < 0) {
month = month + 12;
year = year - 1;
} else if (month > 12) {
month = month - 12;
year = year + 1;
}
String smonth = "";
if (month < 10)
smonth = "0" + month;
else
smonth = "" + month;
return year + "-" + smonth + "-10";
}
public static String getOKDate(String sdate) {
if (sdate == null || sdate.equals(""))
return getStringDateShort();
if (!VeStr.Isdate(sdate)) {
sdate = getStringDateShort();
}
//Convert "/" to "-"
sdate = VeStr.Replace(sdate, "/", "-");
//If there is only an 8-bit length, the conversion takes place
if (sdate.length() == 8)
sdate = sdate.substring(0, 4) + "-" + sdate.substring(4, 6) + "-" + sdate.substring(6, 8);
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
ParsePosition pos = new ParsePosition(0);
Date strtodate = formatter.parse(sdate, pos);
String dateString = formatter.format(strtodate);
return dateString;
}
public static void main(String[] args) throws Exception {
try {
//System.out.print(Integer.valueOf(getTwoDay("2006-11-03 12:22:10", "2006-11-02 11:22:09")));
} catch (Exception e) {
throw new Exception();
}
//System.out.println("sss");
}
}
This site has a basic understanding of how Java gets Date times. What about you?