java - 将日历日期设置为当前日期

Question

我有一个值为 timeInMills 的变量，该值是过去 3 天前的，我想将其日期重置为当前日期，但时间应该是静止的。

Calendar calNow = Calendar.getInstance();
Calendar calSets = (Calendar)calNow.clone();

calSets.setTimeInMillis(TIME_IN_MILL); //set datetime from timeInMillis
//Reset the date to current Date.

如何做到这一点？

Answer 1

像这样，在更改实例之前获取所需的属性:

Calendar calNow = Calendar.getInstance();
Calendar calSets = (Calendar)calNow.clone();

int hours = calNow.get(Calendar.HOUR_OF_DAY)
int minutes = calNow.get(Calendar.MINUTE)

calSets.setTimeInMillis(TIME_IN_MILL); //set datetime from timeInMillis
//Reset the date to current Date.

calSets.set(Calendar.SECOND, 0);
calSets.set(Calendar.MILLISECOND, 0);
calSets.set(Calendar.HOUR_OF_DAY, hours);
calSets.set(Calendar.MINUTE, minutes);