java - 计算日期

Question

friend 们，我从用户那里得到了两个输入

1.InitDate from DatePicker
2.Difference in between two dates (numberOfDates)

我需要这样计算 FinalDate

FinalDate=InitDate+numberOfDates

到目前为止我做了什么

private void CalcLastDate(int days) 
        {

long millis=days*24*60*60;

            Calendar c = Calendar.getInstance();

            c.set(settingsFromDate.getYear(), settingsFromDate.getMonth(), settingsFromDate.getDayOfMonth());
            long initDate = c.getTimeInMillis();

            long longFinalDate=initDate+millis;

}

Answer 1

试试这个:

Calendar cal = Calendar.getInstance();
cal.setTime(initDate); //initDate must be of java.util.Date
cal.add(Calendar.DAY_OF_MONTH, numberOfDates);

您可以通过以下方式获得最终日期:

Date finalDate = cal.getTime();

而且您不必使用第三方 API。