我试图在2个日期之间计算日期如下：
>获取当前日期
>获取过去或未来的日期
>计算不同的差异. 1和否2
>以下列格式显示日期
>如果结果是在过去(2天前)或将来(在2天内)
格式将：天,周,月,年
我尝试了不同的方法,但是无法得到我想要的结果.我发现Android DatePicker对话框将日期转换为整数.我还没有找到一种方法来使DatePicket小部件返回日期变量而不是整数.
private DatePickerDialog.OnDateSetListener mDateSetListener =
new DatePickerDialog.OnDateSetListener() {
public void onDateSet(DatePicker view,**int** year,**int** monthOfYear,**int** dayOfMonth) {
enteredYear = year;
enteredMonth = monthOfYear;
enteredDay = dayOfMonth;
}
};
基于上述,我尝试将系统日期转换为Integer,但是当尝试计算2个日期之间的日期时,这并不真的有效.
private void getSystemDate(){
final Calendar c = Calendar.getInstance();
mYear = c.get(Calendar.YEAR);
systemYear = mYear;
mMonth = c.get(Calendar.MONTH);
systemMonth = mMonth + 1;
mDay = c.get(Calendar.DAY_OF_MONTH);
systemDay = mDay;
}
解决方法
/**
* Returns a string that describes the number of days
* between dateOne and dateTwo.
*
*/
public String getDateDiffString(Date dateOne,Date dateTwo)
{
long timeOne = dateOne.getTime();
long timeTwo = dateTwo.getTime();
long oneDay = 1000 * 60 * 60 * 24;
long delta = (timeTwo - timeOne) / oneDay;
if (delta > 0) {
return "dateTwo is " + delta + " days after dateOne";
}
else {
delta *= -1;
return "dateTwo is " + delta + " days before dateOne";
}
}
编辑：在另一个线程中看到同样的问题：
how to calculate difference between two dates using java
编辑2：要获取年/月/周,请执行以下操作：
int year = delta / 365; int rest = delta % 365; int month = rest / 30; rest = rest % 30; int weeks = rest / 7; int days = rest % 7;
