Calendar的add(,)方法。
For example, to subtract 5 days from the current time of the calendar, you can achieve it by calling:
add(Calendar.DATE, -5).
For example, to subtract 5 days from the current time of the calendar, you can achieve it by calling:
add(Calendar.DATE, -5).
解决方案 »
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public long getDistanceDay(String Start_day, String End_day) {
long day = 0l;
DateFormat df = new SimpleDateFormat("yyyy-MM-dd");
java.util.Date d1, d2;
try {
d1 = df.parse(Start_day);
d2 = df.parse(End_day);
if (d1.getTime() > d2.getTime()) { day = ( (d1.getTime() - d2.getTime()) / 1000) / (24 * 60 * 60);
}
else {
day = ( (d2.getTime() - d1.getTime()) / 1000) / (24 * 60 * 60);
}
}
catch (Exception e) {
System.out.println("can't comp");
} return day; }
import java.text.*;
public class World {
public static void main(String[] args) {
GregorianCalendar worldTour = new GregorianCalendar(1872, Calendar.OCTOBER, 2);
worldTour.add(GregorianCalendar.DATE, 80);
Date d = worldTour.getTime();
DateFormat df = DateFormat.getDateInstance();
String s = df.format(d);
System.out.println("80 day trip will end " + s);
}
}
public int nDaysBetweenTwoDate(Date firstDate,Date secondDate) {
int nDay=(int)((secondDate.getTime()-firstDate.getTime())/(24*60*60*1000));
return nDay;
} // 计算两个日期相隔的天数
public int nDaysBetweenTwoDate(String firstString,String secondString) {
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
Date firstDate=null;
Date secondDate=null;
try {
firstDate = df.parse(firstString);
secondDate=df.parse(secondString);
}
catch(Exception e) {
// 日期型字符串格式错误
} int nDay=(int)((secondDate.getTime()-firstDate.getTime())/(24*60*60*1000));
return nDay;
} // 当前日期加减n天后的日期,返回Date
public Date nDaysAfterNowDate(int n) {
Calendar rightNow = Calendar.getInstance();
//rightNow.add(Calendar.DAY_OF_MONTH,-1);
rightNow.add(Calendar.DAY_OF_MONTH,+n);
return rightNow.getTime();
}
java.text.SimpleDateFormat df=new java.text.SimpleDateFormat("yyyy-MM-dd");
DateFormat dateFormat = DateFormat.getDateInstance(DateFormat.MEDIUM); GregorianCalendar grc=new GregorianCalendar(); grc.setTime(new Date(date)); grc.add(GregorianCalendar.DATE,3); String adder = df.format(grc.getTime()); String nowtime = df.format(now); java.util.Date dt1=df.parse(adder); java.util.Date dt2=df.parse(nowtime); if (dt1.before(dt2)){ blnRet = false; }
return blnRet; }
这是我写的,比较是否是近三天的