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时间格式转化与计算代码（java）

2008-03-07 15:19 633 查看

*
* <p>Title: 时间格式转化与计算</p>
*/

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() {
Calendar c = Calendar.getInstance();
c.add(c.SECOND, 0);

return "" + c.get(c.YEAR) + "" + (c.get(c.MONTH) + 1) + "" + c.get(c.DATE)+""+c.get(c.HOUR_OF_DAY)+""+c.get(c.MINUTE)+""+c.get(c.SECOND);

}

/**
* 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
* @return String yyyy-MM-dd hh:mm:ss
*/

public String getCurrentDate5(){
Calendar c = Calendar.getInstance();
c.add(c.SECOND, 0);
return "" + c.get(c.YEAR) + "-" + (c.get(c.MONTH) + 1) + "-" + c.get(c.DATE)+" "+c.get(c.HOUR_OF_DAY)+":"+c.get(c.MINUTE)+":"+c.get(c.SECOND);
}

/**
* 取得系统当前时间常用于订单号
* @return String yyyyMMddhhmmss
*/
public String getCurrentDate6() {
Calendar c = Calendar.getInstance();
c.add(c.SECOND, 0);
String year=c.get(c.YEAR)+"";
return "" + year.subSequence(2,year.length())+ "" + (c.get(c.MONTH) + 1) + "" + c.get(c.DATE)+"-"+c.get(c.HOUR_OF_DAY)+""+c.get(c.MINUTE)+""+c.get(c.SECOND)+"-"+c.get(c.MILLISECOND);

}

/**
* 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.println(a.getCurrentDate6());
System.out.println(a.getCurrentDate6());
}catch(Exception e){System.err.println();}

}

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