/** * <p>Title: 时间格式转化与计算</p> * <p>Copyright: Copyright (c) 2004</p> * <p>Company: 广东 有限公司</p> * <p>www.fqf.cn</p> * @author 网络信息部 庆丰 * @version 1.0 */package web.com;import java.util.Calendar; import java.util.Date; import java.text.*;public class DateTime { public DateTime() { } /** * 取得系统当前时间 * @return String yyyy-mm-dd */ public String getCurrentDate() { Calendar rightNow = Calendar.getInstance(); int year = rightNow.get(rightNow.YEAR); int month = rightNow.get(rightNow.MONTH) + 1; int day = rightNow.get(rightNow.DATE); return year + "-" + month + "-" + day; } /** * 取得系统当前时间 * @return String yyyy年mm月dd日 */ public String getCurrentDate1() { Calendar rightNow = Calendar.getInstance(); int year = rightNow.get(rightNow.YEAR); int month = rightNow.get(rightNow.MONTH) + 1; int day = rightNow.get(rightNow.DATE); return year + "年" + month + "月" + day + "日"; } /** * 取得系统当前时间 * @return String yyyymmdd */ public String getCurrentDate2() { Calendar rightNow = Calendar.getInstance(); int year = rightNow.get(rightNow.YEAR); int month = rightNow.get(rightNow.MONTH) + 1; int day = rightNow.get(rightNow.DATE); return year + "" + month + "" + day; } /** * 取得系统当前时间 * @return String yyyy-mm */ public String getCurrentDate3() { Calendar rightNow = Calendar.getInstance(); int year = rightNow.get(rightNow.YEAR); int month = rightNow.get(rightNow.MONTH) + 1; //int day = rightNow.get(rightNow.DATE); return year + "-" + month; } /** * 取得系统当前时间 * @return String yyyyMMddhhmmss */ public String getCurrentDate4() { SimpleDateFormat simpleDateFormat =new SimpleDateFormat("yyyyMMddhhmmss"); java.util.Date date = new java.util.Date(); String time = simpleDateFormat.format(date); return time; } /** * 取得系统当前时间 * @return String yyyy-MM-dd hh:mm:ss */ public String getCurrentDate5() { SimpleDateFormat simpleDateFormat =new SimpleDateFormat("yyyy-MM-dd hh:mm:ss"); java.util.Date date = new java.util.Date(); String time = simpleDateFormat.format(date); return time; } /** * 取得系统当前时间前n个月的相对应的一天 * @param n int * @return String yyyy-mm-dd */ public String getNMonthBeforeCurrentDay(int n) { Calendar c = Calendar.getInstance(); c.add(c.MONTH, -n); return "" + c.get(c.YEAR) + "-" + (c.get(c.MONTH) + 1) + "-" + c.get(c.DATE); } /** * 取得系统当前时间后n个月的相对应的一天 * @param n int * @return String yyyy-mm-dd */ public String getNMonthAfterCurrentDay(int n) { Calendar c = Calendar.getInstance(); c.add(c.MONTH, n); return "" + c.get(c.YEAR) + "-" + (c.get(c.MONTH) + 1) + "-" + c.get(c.DATE); } /** * 取得系统当前时间前n天 * @param n int * @return String yyyy-mm-dd */ public String getNDayBeforeCurrentDate(int n) { Calendar c = Calendar.getInstance(); c.add(c.DAY_OF_MONTH, -n); return "" + c.get(c.YEAR) + "-" + (c.get(c.MONTH) + 1) + "-" + c.get(c.DATE); } /** * 取得系统当前时间后n天 * @param n int * @return String yyyy-mm-dd */ public String getNDayAfterCurrentDate(int n) { Calendar c = Calendar.getInstance(); c.add(c.DAY_OF_MONTH, n); return "" + c.get(c.YEAR) + "-" + (c.get(c.MONTH) + 1) + "-" + c.get(c.DATE); } //--------------------------------------------------------------------- //取过去一个时间对应的系统当年的一天 public String getCurrentDateAfterPastDate(String sPastDate) { if (sPastDate != null && !sPastDate.equals("")) { Date date = switchStringToDate(sPastDate); Calendar c = Calendar.getInstance(); c.setTime(date); int iPastYear = c.get(c.YEAR); Calendar c1 = Calendar.getInstance(); int iCurrentYear = c1.get(c1.YEAR); c.add(c.YEAR, iCurrentYear - iPastYear); return "" + c.get(c.YEAR) + "-" + (c.get(c.MONTH) + 1) + "-" + c.get(c.DATE); } else { return null; } }
/** * 将一个日期字符串转化成日期 * @param sDate String * @return Date yyyy-mm-dd */ public Date switchStringToDate(String sDate) { Date date = null; try { SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd"); date = df.parse(sDate); } catch (Exception e) { System.out.println("日期转换失败:" + e.getMessage()); } return date; } /** * 输入两个字符串型的日期,比较两者的大小 * @param fromDate String * @param toDate String * @return boolean before为true */ public boolean compareTwoDateBigOrSmall(String fromDate, String toDate) { Date dateFrom = this.switchStringToDate(fromDate); Date dateTo = this.switchStringToDate(toDate); if (dateFrom.before(dateTo)) { return true; } else { return false; } } /** * 将一个日期字符串转化成Calendar * @param sDate String * @return Calendar */ public Calendar switchStringToCalendar(String sDate) { Date date = switchStringToDate(sDate); Calendar c = Calendar.getInstance(); c.setTime(date); return c; } /** * 将一个日期转化成Calendar * @param date Date * @return Calendar */ public Calendar switchStringToCalendar(Date date) { Calendar c = Calendar.getInstance(); c.setTime(date); return c; } public String string2Date(String dateString) throws java.lang.Exception { /*DateFormat dateFormat; dateFormat = new SimpleDateFormat("yyyy-MM-dd kk:mm:ss"); dateFormat.setLenient(false); java.util.Date timeDate = dateFormat.parse(dateString);//util类型 //java.sql.Date dateTime = new java.sql.Date(timeDate.getTime());//sql类型 java.sql.Timestamp dateTime = new java.sql.Timestamp(timeDate.getTime());//Timestamp类型 */ SimpleDateFormat newk = new SimpleDateFormat ("yyyy.MM.dd hh:mm:ss"); SimpleDateFormat old = new SimpleDateFormat("MMM dd hh:mm:ss yyyy"); String strDate = "Mar 22 00:42:00 2002"; Date d = old.parse(strDate); System.out.println(newk.format(d)); return newk.format(d); } /** * 取得某个时间前n个月的相对应的一天 * @param sDate String * @param n int * @return String yyyy-mm-dd */ public String getNMonthBeforeOneDay(String sDate, int n) { Calendar c = switchStringToCalendar(sDate); c.add(c.MONTH, -n); return "" + c.get(c.YEAR) + "-" + (c.get(c.MONTH) + 1) + "-" + c.get(c.DATE); } //取得某个时间后n个月的相对应的一天 public String getNMonthAfterOneDay(String sDate, int n) { Calendar c = switchStringToCalendar(sDate); c.add(c.MONTH, n); return "" + c.get(c.YEAR) + "-" + (c.get(c.MONTH) + 1) + "-" + c.get(c.DATE); } //取得某个时间前n天,格式为yyyy-mm-dd public String getNDayBeforeOneDate(String sDate, int n) { Calendar c = switchStringToCalendar(sDate); c.add(c.DAY_OF_MONTH, -n); return "" + c.get(c.YEAR) + "-" + (c.get(c.MONTH) + 1) + "-" + c.get(c.DATE); } //取得某个时间后n天,格式为yyyy-mm-dd public String getNDayAfterOneDate(String sDate, int n) { Calendar c = switchStringToCalendar(sDate); c.add(c.DAY_OF_MONTH, n); return "" + c.get(c.YEAR) + "-" + (c.get(c.MONTH) + 1) + "-" + c.get(c.DATE); } //判断系统当前时间是不是润年 public boolean isRunNian() { java.util.Calendar rightNow = java.util.Calendar.getInstance(); int year = rightNow.get(rightNow.YEAR); if (0 == year % 4 && (year % 100 != 0 || year % 400 == 0)) { return true; } else { return false; } } public static void main(String args[]) { DateTime a = new DateTime(); try{ //System.out.print(a.string2Date("Mar 22 00:42:00 2002")); }catch(Exception e){System.err.println();} } }
import java.io.*; import java.util.*; import java.util.Date; import java.util.Calendar; public class Test2 { public static void main(String args[]) throws Exception { Date date=new Date("2005/2/27 "); // date.setTime(date.getTime()+3*24*3600*1000); date.setDate(date.getDate()+3); System.out.println(date); } }上面我写的那两条语句都可以实现你要的功能(有一条注释掉了)
you should first pasre the string to a Date object, then use Calendar to manipulate the date directly. Check SimpleDateFormat class and Calender class.
getDaysAfterByString(String s,int daysAfter,char token){ Calendar time=Calendar.getInstance(); int i=0; int [] t=new int[3] while(i<s.size()){ t[i]=s.indexof(i,token); i++; }
* <p>Title: 时间格式转化与计算</p>
* <p>Copyright: Copyright (c) 2004</p>
* <p>Company: 广东 有限公司</p>
* <p>www.fqf.cn</p>
* @author 网络信息部 庆丰
* @version 1.0
*/package web.com;import java.util.Calendar;
import java.util.Date;
import java.text.*;public class DateTime {
public DateTime() {
} /**
* 取得系统当前时间
* @return String yyyy-mm-dd
*/
public String getCurrentDate() {
Calendar rightNow = Calendar.getInstance();
int year = rightNow.get(rightNow.YEAR);
int month = rightNow.get(rightNow.MONTH) + 1;
int day = rightNow.get(rightNow.DATE);
return year + "-" + month + "-" + day;
} /**
* 取得系统当前时间
* @return String yyyy年mm月dd日
*/
public String getCurrentDate1() {
Calendar rightNow = Calendar.getInstance();
int year = rightNow.get(rightNow.YEAR);
int month = rightNow.get(rightNow.MONTH) + 1;
int day = rightNow.get(rightNow.DATE);
return year + "年" + month + "月" + day + "日";
} /**
* 取得系统当前时间
* @return String yyyymmdd
*/
public String getCurrentDate2() {
Calendar rightNow = Calendar.getInstance();
int year = rightNow.get(rightNow.YEAR);
int month = rightNow.get(rightNow.MONTH) + 1;
int day = rightNow.get(rightNow.DATE);
return year + "" + month + "" + day;
} /**
* 取得系统当前时间
* @return String yyyy-mm
*/
public String getCurrentDate3() {
Calendar rightNow = Calendar.getInstance();
int year = rightNow.get(rightNow.YEAR);
int month = rightNow.get(rightNow.MONTH) + 1;
//int day = rightNow.get(rightNow.DATE);
return year + "-" + month;
} /**
* 取得系统当前时间
* @return String yyyyMMddhhmmss
*/
public String getCurrentDate4() {
SimpleDateFormat simpleDateFormat =new SimpleDateFormat("yyyyMMddhhmmss");
java.util.Date date = new java.util.Date();
String time = simpleDateFormat.format(date);
return time;
} /**
* 取得系统当前时间
* @return String yyyy-MM-dd hh:mm:ss
*/
public String getCurrentDate5() {
SimpleDateFormat simpleDateFormat =new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
java.util.Date date = new java.util.Date();
String time = simpleDateFormat.format(date);
return time;
} /**
* 取得系统当前时间前n个月的相对应的一天
* @param n int
* @return String yyyy-mm-dd
*/
public String getNMonthBeforeCurrentDay(int n) {
Calendar c = Calendar.getInstance();
c.add(c.MONTH, -n);
return "" + c.get(c.YEAR) + "-" + (c.get(c.MONTH) + 1) + "-" + c.get(c.DATE); } /**
* 取得系统当前时间后n个月的相对应的一天
* @param n int
* @return String yyyy-mm-dd
*/
public String getNMonthAfterCurrentDay(int n) {
Calendar c = Calendar.getInstance();
c.add(c.MONTH, n);
return "" + c.get(c.YEAR) + "-" + (c.get(c.MONTH) + 1) + "-" + c.get(c.DATE); } /**
* 取得系统当前时间前n天
* @param n int
* @return String yyyy-mm-dd
*/
public String getNDayBeforeCurrentDate(int n) {
Calendar c = Calendar.getInstance();
c.add(c.DAY_OF_MONTH, -n);
return "" + c.get(c.YEAR) + "-" + (c.get(c.MONTH) + 1) + "-" + c.get(c.DATE);
} /**
* 取得系统当前时间后n天
* @param n int
* @return String yyyy-mm-dd
*/
public String getNDayAfterCurrentDate(int n) {
Calendar c = Calendar.getInstance();
c.add(c.DAY_OF_MONTH, n);
return "" + c.get(c.YEAR) + "-" + (c.get(c.MONTH) + 1) + "-" + c.get(c.DATE);
} //---------------------------------------------------------------------
//取过去一个时间对应的系统当年的一天
public String getCurrentDateAfterPastDate(String sPastDate) {
if (sPastDate != null && !sPastDate.equals("")) {
Date date = switchStringToDate(sPastDate);
Calendar c = Calendar.getInstance();
c.setTime(date);
int iPastYear = c.get(c.YEAR);
Calendar c1 = Calendar.getInstance();
int iCurrentYear = c1.get(c1.YEAR);
c.add(c.YEAR, iCurrentYear - iPastYear);
return "" + c.get(c.YEAR) + "-" + (c.get(c.MONTH) + 1) + "-" +
c.get(c.DATE);
}
else {
return null;
}
}
* 将一个日期字符串转化成日期
* @param sDate String
* @return Date yyyy-mm-dd
*/
public Date switchStringToDate(String sDate) {
Date date = null;
try {
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
date = df.parse(sDate); }
catch (Exception e) {
System.out.println("日期转换失败:" + e.getMessage());
}
return date;
} /**
* 输入两个字符串型的日期,比较两者的大小
* @param fromDate String
* @param toDate String
* @return boolean before为true
*/
public boolean compareTwoDateBigOrSmall(String fromDate, String toDate) {
Date dateFrom = this.switchStringToDate(fromDate);
Date dateTo = this.switchStringToDate(toDate);
if (dateFrom.before(dateTo)) {
return true;
}
else {
return false;
}
} /**
* 将一个日期字符串转化成Calendar
* @param sDate String
* @return Calendar
*/
public Calendar switchStringToCalendar(String sDate) {
Date date = switchStringToDate(sDate);
Calendar c = Calendar.getInstance();
c.setTime(date);
return c;
} /**
* 将一个日期转化成Calendar
* @param date Date
* @return Calendar
*/
public Calendar switchStringToCalendar(Date date) {
Calendar c = Calendar.getInstance();
c.setTime(date);
return c;
} public String string2Date(String dateString)
throws java.lang.Exception {
/*DateFormat dateFormat;
dateFormat = new SimpleDateFormat("yyyy-MM-dd kk:mm:ss");
dateFormat.setLenient(false);
java.util.Date timeDate = dateFormat.parse(dateString);//util类型
//java.sql.Date dateTime = new java.sql.Date(timeDate.getTime());//sql类型
java.sql.Timestamp dateTime = new java.sql.Timestamp(timeDate.getTime());//Timestamp类型
*/
SimpleDateFormat newk = new SimpleDateFormat ("yyyy.MM.dd hh:mm:ss");
SimpleDateFormat old = new SimpleDateFormat("MMM dd hh:mm:ss yyyy"); String strDate = "Mar 22 00:42:00 2002";
Date d = old.parse(strDate);
System.out.println(newk.format(d)); return newk.format(d);
} /**
* 取得某个时间前n个月的相对应的一天
* @param sDate String
* @param n int
* @return String yyyy-mm-dd
*/
public String getNMonthBeforeOneDay(String sDate, int n) {
Calendar c = switchStringToCalendar(sDate);
c.add(c.MONTH, -n);
return "" + c.get(c.YEAR) + "-" + (c.get(c.MONTH) + 1) + "-" + c.get(c.DATE); } //取得某个时间后n个月的相对应的一天
public String getNMonthAfterOneDay(String sDate, int n) {
Calendar c = switchStringToCalendar(sDate);
c.add(c.MONTH, n);
return "" + c.get(c.YEAR) + "-" + (c.get(c.MONTH) + 1) + "-" + c.get(c.DATE); } //取得某个时间前n天,格式为yyyy-mm-dd
public String getNDayBeforeOneDate(String sDate, int n) {
Calendar c = switchStringToCalendar(sDate);
c.add(c.DAY_OF_MONTH, -n);
return "" + c.get(c.YEAR) + "-" + (c.get(c.MONTH) + 1) + "-" + c.get(c.DATE);
} //取得某个时间后n天,格式为yyyy-mm-dd
public String getNDayAfterOneDate(String sDate, int n) {
Calendar c = switchStringToCalendar(sDate);
c.add(c.DAY_OF_MONTH, n);
return "" + c.get(c.YEAR) + "-" + (c.get(c.MONTH) + 1) + "-" + c.get(c.DATE);
} //判断系统当前时间是不是润年
public boolean isRunNian() {
java.util.Calendar rightNow = java.util.Calendar.getInstance();
int year = rightNow.get(rightNow.YEAR);
if (0 == year % 4 && (year % 100 != 0 || year % 400 == 0)) {
return true;
}
else {
return false;
} } public static void main(String args[]) {
DateTime a = new DateTime();
try{
//System.out.print(a.string2Date("Mar 22 00:42:00 2002"));
}catch(Exception e){System.err.println();} }
}
import java.util.*;
import java.util.Date;
import java.util.Calendar;
public class Test2
{
public static void main(String args[]) throws Exception
{
Date date=new Date("2005/2/27 ");
// date.setTime(date.getTime()+3*24*3600*1000);
date.setDate(date.getDate()+3);
System.out.println(date);
}
}上面我写的那两条语句都可以实现你要的功能(有一条注释掉了)
getDaysAfterByString(String s,int daysAfter,char token){ Calendar time=Calendar.getInstance();
int i=0;
int [] t=new int[3]
while(i<s.size()){
t[i]=s.indexof(i,token);
i++;
}
time.set(Calendar.YEAR,t[0]);
time.set(Calendar.MONTH,t[1]);
time.set(Calendar.DATE,t[2]+3);
return time;
}
t.add(Calendar.DATE, 3);
System.out.println(t.get(t.YEAR)+"/"+(t.get(t.MONTH)+1)+"/"+t.get(t.DATE));
t.add(Calendar.DATE, 3);