在研发闲暇时间，将开发过程比较重要的一些代码段做个记录，如下代码内容是关于Java日期时间操作示例大全的代码，应该是对小伙伴们有所用途。
日期类
import java.util.Calendar;
public class VeDate {
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();
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);
} 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);
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);
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);
}
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 (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) {
Date dd = VeDate.strToDate(sdate);
Calendar c = Calendar.getInstance();
c.setTime(dd);
c.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
c.set(Calendar.DAY_OF_WEEK, Calendar.TUESDAY);
c.set(Calendar.DAY_OF_WEEK, Calendar.WEDNESDAY);
c.set(Calendar.DAY_OF_WEEK, Calendar.THURSDAY);
c.set(Calendar.DAY_OF_WEEK, Calendar.FRIDAY);
c.set(Calendar.DAY_OF_WEEK, Calendar.SATURDAY);
c.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY);
return new SimpleDateFormat(“yyyy-MM-dd”).format(c.getTime());
}
public static String getWeek(String sdate) {
Date date = VeDate.strToDate(sdate);
Calendar c = Calendar.getInstance();
c.setTime(date);
return new SimpleDateFormat(“EEEE”).format(c.getTime());
}
public static String getWeekStr(String sdate){
String str = “”;
str = VeDate.getWeek(sdate);
if(“1″.equals(str)){
str = “星期日”;
}else if(“2″.equals(str)){
str = “星期一”;
}else if(“3″.equals(str)){
str = “星期二”;
}else if(“4″.equals(str)){
str = “星期三”;
}else if(“5″.equals(str)){
str = “星期四”;
}else if(“6″.equals(str)){
str = “星期五”;
}else if(“7″.equals(str)){
str = “星期六”;
}
return str;
}
public static long getDays(String date1, String date2) {
if (date1 == null || date1.equals(“”))
return 0;
if (date2 == null || date2.equals(“”))
return 0;
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) {
}
return day;
}
public static String getNowMonth(String sdate) {
sdate = sdate.substring(0, 8) + “01″;
Date date = VeDate.strToDate(sdate);
Calendar c = Calendar.getInstance();
c.setTime(date);
int u = c.get(Calendar.DAY_OF_WEEK);
String newday = VeDate.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();
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;
}
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 sreturn = “”;
roc.util.MyChar mc = new roc.util.MyChar();
if (nd.equals(“1″)) {
sreturn = s_nd;
if (format.equals(“1″))
sreturn = sreturn + “年”;
else if (format.equals(“2″))
sreturn = sreturn + “-”;
else if (format.equals(“3″))
sreturn = sreturn + “/”;
else if (format.equals(“5″))
sreturn = sreturn + “.”;
}
if (yf.equals(“1″)) {
sreturn = sreturn + s_yf;
if (format.equals(“1″))
sreturn = sreturn + “月”;
else if (format.equals(“2″))
sreturn = sreturn + “-”;
else if (format.equals(“3″))
sreturn = sreturn + “/”;
else if (format.equals(“5″))
sreturn = sreturn + “.”;
}
if (rq.equals(“1″)) {
sreturn = sreturn + s_rq;
if (format.equals(“1″))
sreturn = sreturn + “日”;
}
} else {
sdate = roc.util.RocDate.getOKDate(sdate);
if (nd.equals(“1″)) {
sreturn = s_nd;
if (format.equals(“1″))
sreturn = sreturn + “年”;
else if (format.equals(“2″))
sreturn = sreturn + “-”;
else if (format.equals(“3″))
sreturn = sreturn + “/”;
else if (format.equals(“5″))
sreturn = sreturn + “.”;
}
if (yf.equals(“1″)) {
sreturn = sreturn + s_yf;
if (format.equals(“1″))
sreturn = sreturn + “月”;
else if (format.equals(“2″))
sreturn = sreturn + “-”;
else if (format.equals(“3″))
sreturn = sreturn + “/”;
else if (format.equals(“5″))
sreturn = sreturn + “.”;
}
if (rq.equals(“1″)) {
sreturn = sreturn + s_rq;
if (format.equals(“1″))
sreturn = sreturn + “日”;
}
}
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();
}
sdate = VeStr.Replace(sdate, “/”, “-”);
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 {
} catch (Exception e) {
throw new Exception();
}
}
}