Java日期操作大全

Java代码



public static final String FormatDayToChinaTime24H = "yyyy年MM月dd日";

/**

* 将yyyy-mm-dd转为yyyy-m-d

*

* @param day

* 距离现在之后的天数

* @return Date:距离现在之后的若干天的日期;

*/

public static String getYMDDays(String day){

String dayTime=day;

if(String.valueOf(day.charAt(8)).equals("0"))dayTime=day.substring(0,8)+day.substring(9);

if(String.valueOf(day.charAt(5)).equals("0"))dayTime=dayTime.substring(0,5)+dayTime.substring(6);

return dayTime;

}

/**

* 两个日期间的天数

*

* @param days

* 距离现在之后的天数

* @return Date:距离现在之后的若干天的日期;

*/

public static int getIntervalDays(Date startday,Date endday){

if(startday.after(endday)){

Date cal=startday;

startday=endday;

endday=cal;

}

long sl=startday.getTime();

long el=endday.getTime();

long ei=el-sl;

return (int)(ei/(1000*60*60*24));

}

/**

* 取得距离现在多少天（距离现在之后的若干天）

*

* @param days

* 距离现在之后的天数

* @return Date:距离现在之后的若干天的日期;

*/

public static Date getDate(int days) {

Date dateresult = new Date();

try {

DateFormat dateFormat = DateFormat.getDateInstance(DateFormat.FULL);

// Create our Gregorian Calendar.

GregorianCalendar cal = new GregorianCalendar();

// Set the date and time of our calendar

// to the system&s date and time

cal.setTime(new Date());

cal.add(GregorianCalendar.DAY_OF_MONTH, days);

dateresult = cal.getTime();

} catch (Exception e) {

System.out.println("exception" + e.toString());

}

return dateresult;

}

/**

* @根据当前日期计算n天后的日期

* @return String

*/

public static Date afterNDay(Date date, int n) {

Calendar c = Calendar.getInstance();

DateFormat df = new SimpleDateFormat("yyyy-MM-dd");

c.setTime(date);

c.add(Calendar.DATE, n);

Date d2 = c.getTime();

// String s=df.format(d2);

return d2;

}

/**

* @根据当前日期计算n天后的日期

* @return String

*/

public static String afterDay(Date date, int n) {

Calendar c = Calendar.getInstance();

DateFormat df = new SimpleDateFormat("yyyy-MM-dd");

// String s=df.format(d2);

return df.toString();

}

/**

* @获取当前时间是星期几，“星期日”

* @return String

*/

public static String getDayInWeek() {

Date today = new Date(System.currentTimeMillis());

SimpleDateFormat simpleDateFormat = new SimpleDateFormat("E");

return simpleDateFormat.format(today);

}

/**

*

* @跟具字符串时间来获得星期几，(SimpleDateFormat("yyyy-MM-dd"))

* @return

*/

public static String getDayInWeek(String mydatestring) {

SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");

Date date = null;

String showDate ="";

try {

date = dateFormat.parse(mydatestring);

} catch (ParseException e) {

}

Calendar cd = Calendar.getInstance();

cd.setTime(date);

int mydate = cd.get(Calendar.DAY_OF_WEEK);

switch (mydate) {

case 1:

showDate = "星期日";

break;

case 2:

showDate = "星期一";

break;

case 3:

showDate = "星期二";

break;

case 4:

showDate = "星期三";

break;

case 5:

showDate = "星期四";

break;

case 6:

showDate = "星期五";

break;

default:

showDate = "星期六";

break;

}

return showDate;

}

/**

* @根据日期时间，获取当前时间是星期几，“星期日”

* @return String

*/

public static String getDayInWeek(Date date) {

if (date == null)

return "";

SimpleDateFormat simpleDateFormat = new SimpleDateFormat("E");

return simpleDateFormat.format(date);

}

/**

* @获取当前时间在这个月的天

* @return String

*/

public static String getDayInMonth() {

Date today = new Date(System.currentTimeMillis());

SimpleDateFormat simpleDateFormat = new SimpleDateFormat("d");

return simpleDateFormat.format(today);

}

/**

* @根据日期，获取当前时间在这个月的天

* @return String

*/

public static String getDayInMonth(Date date) {

if (date == null)

return "";

SimpleDateFormat simpleDateFormat = new SimpleDateFormat("d");

return simpleDateFormat.format(date);

}

/**

* @根据在本年当中，获取月份格式"M"

* @return String

*/

public static String getMonthInYear() {

Date today = new Date(System.currentTimeMillis());

SimpleDateFormat simpleDateFormat = new SimpleDateFormat("M");

return simpleDateFormat.format(today);

}

/**

* @根据在本年当中，获取月份格式"MM"

* @return String

*/

public static String getMonthInYear2() {

java.util.Date today = new Date(System.currentTimeMillis());

SimpleDateFormat simpleDateFormat = new SimpleDateFormat("MM");

return simpleDateFormat.format(today);

}

/**

* @根据日期，获取月份格式"MM"

* @return String

*/

public static String getMonthInYear2(String formatDate) {

java.util.Date day = getDate(formatDate, "yyyy-MM-dd");

SimpleDateFormat simpleDateFormat = new SimpleDateFormat("MM");

return simpleDateFormat.format(day);

}

/**

* @获取当前时间的年，格式"yyyy"

* @return String

*/

public static String getYear() {

java.util.Date today = new java.util.Date(System.currentTimeMillis());

SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy");

return simpleDateFormat.format(today);

}

/**

* @根据时间，获取年，格式"yyyy"

* @return String

*/

public static String getYear(String formatDate) {

java.util.Date day = getDate(formatDate, "yyyy-MM-dd");

SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy");

return simpleDateFormat.format(day);

}

/**

* @根据日期以及日期格式，获取日期字符串表达

* @return String

*/

public static String getFormatDate(java.util.Date thisDate, String format) {

if (thisDate == null)

return "";

SimpleDateFormat simpleDateFormat = new SimpleDateFormat(format);

return simpleDateFormat.format(thisDate);

}

/**

* @根据日期以及日期格式，获取日期

* @return String

*/

public static java.util.Date getDate(String date, String format) {

SimpleDateFormat simpleDateFormat = new SimpleDateFormat(format);

try {

return simpleDateFormat.parse(date);

} catch (ParseException ex) {

return null;

}

}

/**

* @返回系统当前月的第一天所表示的日期

* @param monthDate

* Date

* @return Date

*/

public static java.util.Date getFirstDateMonth() {

try {

String date_s = getYear() + "-" + getMonthInYear2() + "-01";

return getDate(date_s, "yyyy-MM-dd");

} catch (Exception er) {

er.printStackTrace();

}

return null;

}

/**

* @返回系统当前月的第一天所表示的日期

* @param monthDate

* Date

* @return Date

*/

public static java.util.Date getFirstDateMonth(String formatDate) {

try {

String date_s = getYear(formatDate) + "-"

+ getMonthInYear2(formatDate) + "-01";

return getDate(date_s, "yyyy-MM-dd");

} catch (Exception er) {

er.printStackTrace();

}

return null;

}

/**

* @返回系统当前月的第一天所表示的日期

* @param monthDate

* Date

* @return Date

*/

public static String getFirstDateMonthToString() {

try {

return getYear() + "-" + getMonthInYear2() + "-01";

} catch (Exception er) {

er.printStackTrace();

}

return null;

}

/**

* @返回系统当前月的第一天所表示的日期

* @param monthDate

* Date

* @return Date

*/

public static String getFirstDateMonthToString(String formatDate) {

try {

return getYear(formatDate) + "-" + getMonthInYear2(formatDate)

+ "-01";

} catch (Exception er) {

er.printStackTrace();

}

return null;

}

/**

* @返回系统当前月的最后一天所表示的日期

* @return Date

*/

public static java.util.Date getLastDateMonth() {

try {

int lastday = getDaySumInTheMonth();

String date_s;

if (lastday < 10)

date_s = getYear() + "-" + getMonthInYear2() + "-0" + lastday;

else

date_s = getYear() + "-" + getMonthInYear2() + "-" + lastday;

return getDate(date_s, "yyyy-MM-d");

} catch (Exception er) {

er.printStackTrace();

}

return null;

}

/**

* @返回系统当前月的最后一天所表示的日期

* @return Date

*/

public static String getLastDateMonthToString(String formatDate) {

try {

int lastday = getDaySumInTheMonth(formatDate);

if (lastday < 10)

return getYear(formatDate) + "-" + getMonthInYear2(formatDate)

+ "-0" + lastday;

else

return getYear(formatDate) + "-" + getMonthInYear2(formatDate)

+ "-" + lastday;

} catch (Exception er) {

er.printStackTrace();

}

return null;

}

/**

* @根据时间，返回最后一天所表示的日期

* @param formatDate

* String

* @return Date

*/

public static java.util.Date getLastDateMonth(String formatDate) {

try {

int lastday = getDaySumInTheMonth(formatDate);

String month = getMonthInYear2(formatDate);

String year = getYear(formatDate);

String date_s;

if (lastday < 10)

date_s = year + "-" + month + "-0" + lastday;

else

date_s = year + "-" + month + "-" + lastday;

System.out.println(date_s);

return getDate(date_s, "yyyy-MM-d");

} catch (Exception er) {

er.printStackTrace();

}

return null;

}

/**

* @获得这个月的天数

* @return int

*/

public static int getDaySumInTheMonth() {

String month = DayFormat.getMonthInYear();

if (month.equalsIgnoreCase("12"))

return 31;

int mon = Integer.parseInt(month);

java.util.Date date = DayFormat.getDate(DayFormat.getYear() + "-"

+ (mon + 1) + "-" + "1", "yyyy-MM-d");

Calendar cal = Calendar.getInstance();

cal.setTime(date);

cal.add(Calendar.DATE, -1);

return Integer.parseInt(new SimpleDateFormat("dd")

.format(cal.getTime()));

}

/**

* @获得所在日期月份的天数

* @return int

*/

public static int getDaySumInTheMonth(java.util.Date date) {

String month = new SimpleDateFormat("MM").format(date);

if (month.equalsIgnoreCase("12"))

return 31;

int mon = Integer.parseInt(month);

java.util.Date date2 = DayFormat.getDate(new SimpleDateFormat("yyyy")

.format(date)

+ "-" + (mon + 1) + "-" + "1", "yyyy-MM-d");

Calendar cal = Calendar.getInstance();

cal.setTime(date2);

cal.add(Calendar.DATE, -1);

return Integer.parseInt(new SimpleDateFormat("dd")

.format(cal.getTime()));

}

/**

* @获得所在日期月份的天数

* @return int

*/

public static int getDaySumInTheMonth(String formatDate) {

String month = DayFormat.getMonthInYear2(formatDate);

if (month.equalsIgnoreCase("12"))

return 31;

int mon = Integer.parseInt(month);

java.util.Date date = DayFormat.getDate(DayFormat.getYear(formatDate)

+ "-" + (mon + 1) + "-" + "1", "yyyy-MM-d");

Calendar cal = Calendar.getInstance();

cal.setTime(date);

cal.add(Calendar.DATE, -1);

return Integer.parseInt(new SimpleDateFormat("dd")

.format(cal.getTime()));

}

/**

* @把日期格式转换成字符串格式,格式为'yyyy-MM-dd'

* @param date

* Date

* @return String

*/

public static String getFormatDate(java.util.Date date) {

SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");

return simpleDateFormat.format(date);

}

public final static String FormatDay1 = "yyyy-MM-dd";

public final static String FormatDay2 = "yyyy年MM月dd日";

public final static String FormatDay3 = "yyyy年MM月dd日 HH:mm:ss";

public final static String FormatDay4 = "yyyy-MM-dd HH:mm";

public static final String Format24Datetime1 = "yyyy-MM-dd HH:mm:ss";// 24

public static final String Format12Datetime1 = "yyyy-MM-dd hh:mm:ss";// 12

/**

* 获取当前时间

*

* @return

*/

public static String getToday() {

return getToday(FormatDay1);

}

public static java.sql.Timestamp getCurrentTimestamp() {

return new Timestamp(System.currentTimeMillis());

}

public static java.util.Date getCurrentUtilDate() {

return new java.util.Date(System.currentTimeMillis());

}

public static String getToday(String formatDay) {

java.util.Date today = new java.util.Date();

SimpleDateFormat df = new SimpleDateFormat(formatDay);

return df.format(today).toString();

}

public static String get24DateTime() {

return get24DateTime(Format24Datetime1);

}

public static String get24DateTime(String format24DateTime) {

java.util.Date today = new java.util.Date();

SimpleDateFormat df = new SimpleDateFormat(format24DateTime);

return df.format(today).toString();

}

public static String get12DateTime() {

return get12DateTime(Format12Datetime1);

}

public static String get12DateTime(String format12DateTime) {

java.util.Date today = new java.util.Date();

SimpleDateFormat df = new SimpleDateFormat(format12DateTime);

return df.format(today).toString();

}

public static String get24DateTime(Timestamp timestamp) {

SimpleDateFormat df = new SimpleDateFormat(Format24Datetime1);

return df.format(timestamp).toString();

}

public static String get12DateTime(Timestamp timestamp) {

SimpleDateFormat df = new SimpleDateFormat(Format12Datetime1);

return df.format(timestamp).toString();

}

// STRING到日期

public static java.sql.Date stringToDate(String dateStr) {

return java.sql.Date.valueOf(dateStr);

}

public static java.sql.Timestamp stringToTimestamp(String timestampStr) {

if (timestampStr == null || timestampStr.length() < 1)

return null;

return java.sql.Timestamp.valueOf(timestampStr);

}

public static java.sql.Timestamp stringToTimestamp2(String dateStr) {

if (dateStr == null || dateStr.length() < 1)

return null;

return java.sql.Timestamp.valueOf(dateStr + " 00:00:00.000000000");

}

public static java.sql.Timestamp stringToTimestamp3(String dateStr) {

if (dateStr == null || dateStr.length() < 1)

return null;

return java.sql.Timestamp.valueOf(dateStr + ":00.000000000");

}

public static java.sql.Time stringToTime(String timeStr) {

return java.sql.Time.valueOf(timeStr);

}

// 日期到STRING

public static String dateToString(java.sql.Date datee) {

return datee.toString();

}

public static String timestampToString(java.sql.Timestamp timestampe) {

return timestampe.toString();

}

public static String timestampToStringForFormat(Timestamp timestamp,

String format) {

if (timestamp == null)

return "";

SimpleDateFormat df = new SimpleDateFormat(format);

return df.format(timestamp).toString();

}

public static String getTimestampToDateTime15Len(

java.sql.Timestamp timestampe) {

if (timestampe == null || timestampe.toString().length() < 1)

return "";

return timestampe.toString().substring(0, 16);

}

public static String timeToString(java.sql.Time timee) {

return timee.toString();

}

public static java.sql.Timestamp StringToTimestamp(String dateString)

throws ParseException {

java.text.SimpleDateFormat formatter = new java.text.SimpleDateFormat(

FormatDay1);

formatter.setLenient(false);

return new java.sql.Timestamp((formatter.parse(dateString).getTime()));

}

public static java.sql.Timestamp StringToTimestampAll(String dateString)

throws ParseException {

return java.sql.Timestamp.valueOf(dateString);

}

//获得周日的日期

public static String getSunday(Date date){

Calendar c = Calendar.getInstance();

c.setTime(date);

c.set(Calendar.DAY_OF_WEEK,Calendar.SUNDAY);

return new SimpleDateFormat("yyyy-MM-dd").format(c.getTime());

}

//获得周一的日期

public static String getMonday(Date date){

Calendar c = Calendar.getInstance();

c.setTime(date);

c.set(Calendar.DAY_OF_WEEK,Calendar.MONDAY);

return new SimpleDateFormat("yyyy-MM-dd").format(c.getTime());

}

//获得周二的日期

public static String getTuesday(Date date){

Calendar c = Calendar.getInstance();

c.setTime(date);

c.set(Calendar.DAY_OF_WEEK,Calendar.TUESDAY);

return new SimpleDateFormat("yyyy-MM-dd").format(c.getTime());

}

//获得周三的日期

public static String getWednesday(Date date){

Calendar c = Calendar.getInstance();

c.setTime(date);

c.set(Calendar.DAY_OF_WEEK,Calendar.WEDNESDAY);

return new SimpleDateFormat("yyyy-MM-dd").format(c.getTime());

}

//获得周四的日期

public static String getThursday(Date date){

Calendar c = Calendar.getInstance();

c.setTime(date);

c.set(Calendar.DAY_OF_WEEK,Calendar.THURSDAY);

return new SimpleDateFormat("yyyy-MM-dd").format(c.getTime());

}

//获得周五的日期

public static String getFriday(Date date){

Calendar c = Calendar.getInstance();

c.setTime(date);

c.set(Calendar.DAY_OF_WEEK,Calendar.FRIDAY);

return new SimpleDateFormat("yyyy-MM-dd").format(c.getTime());

}

//获得周六的日期

public static String getSaturday(Date date){

Calendar c = Calendar.getInstance();

c.setTime(date);

c.set(Calendar.DAY_OF_WEEK,Calendar.SATURDAY);

return new SimpleDateFormat("yyyy-MM-dd").format(c.getTime());

}

public static void main(String args[]) {

try {

String d = "2007-05-15 19:23:48.703";

System.out.println(d);

java.sql.Timestamp timestampe = java.sql.Timestamp.valueOf(d);

System.out.println(timestampe.toString());

} catch (Exception er) {

er.printStackTrace();

}

}