Question

可能重复：
How can I find the number of days betwen two Dates?

我正面临着如何通过比较2个日期来获得已经过去的天数的问题。目前我尝试使用compareTo（）但它只返回1或-1，我想获得已经过去的天数。 Thannks

Answer 1

这应该有效它的java代码。只需修改即可使用android

import java.util.*;
 public class DateDifference {
 public static void main(String args[]){
 DateDifference difference = new DateDifference();
 }
DateDifference() {
Calendar cal1 = new GregorianCalendar();
Calendar cal2 = new GregorianCalendar();

cal1.set(2008, 8, 1); 
cal2.set(2008, 9, 31);
System.out.println("Days= "+daysBetween(cal1.getTime(),cal2.getTime()));
}
public int daysBetween(Date d1, Date d2){
return (int)( (d2.getTime() - d1.getTime()) / (1000 * 60 * 60 * 24));
}
}

Answer 2

compareTo（）方法（如果使用Data / DateTime（）作为示例）只会给你：

返回一个整数，指示此实例是否早于与指定的Date / DateTime值相同或晚于指定的Date / DateTime值。（MSDN）

这就是为什么你只得到介于-1和1之间的数字而不是天数（你可以在MSDN上检查

为了做你想做的事，请查看这篇文章：Number of days between 2 dates

Answer 3

我希望这会对你有所帮助

 import java.util.*; import java.util.Calendar;

 public class DeltaDays { public static void main(String[] args) {
// Creates two calendars instances 

Calendar calendar1 = Calendar.getInstance(); Calendar calendar2 = Calendar.getInstance();

 // Set the date for both of the calendar instance 
calendar1.set(2007, 12, 30); calendar2.set(2008, 05, 03);

 // Get the represented date in milliseconds
 long milis1 = calendar1.getTimeInMillis(); long milis2 = calendar2.getTimeInMillis();

// Calculate difference in milliseconds 
long day = milis2 - milis1;

 // Calculate difference in seconds 
long diffSeconds = day / 1000;

 // Calculate difference in minutes 
long diffMinutes = day / (60 * 1000);

 // Calculate difference in hours 
long diffHours = day / (60 * 60 * 1000);

 // Calculate difference in days 
long diffDays = day / (24 * 60 * 60 * 1000);

 System.out.println("In milliseconds: " + day + " milliseconds.");
 System.out.println("In seconds: " + diffSeconds + " seconds.");
 System.out.println("In minutes: " + diffMinutes + " minutes.");
 System.out.println("In hours: " + diffHours + " hours.");
 System.out.println("In days: " + diffDays + " days."); } }

Answer 4

试试这个，在你的android项目中使用dateDifference（）方法：

import java.util.Calendar;
import java.util.Date;

public class Sample {

public static void main(String arg[])
{

dateDifference();

}

public static void dateDifference()
{ 
Date currentdate = new Date();
Calendar calUpdated = Calendar.getInstance();
calUpdated.set(2012, 01, 01);
long currentDateMilliSec = currentdate.getTime();
long updateDateMilliSec = calUpdated.getTimeInMillis();
long diffDays = (currentDateMilliSec - updateDateMilliSec) / (24 * 60 * 60 * 1000);
System.out.println("Time in days: " + diffDays + " days.");
}
}

比较日期并获取天数

4 个答案: