Java日期差异的天数

Question

有谁能帮助我Date以有效的方式计算天数方面的差异？

Date nextCollectionDate = dispenseNormal.getDispensing().getNextCollectionDate();
Date currentDate = new Date();
int daysDiff = currentDate - nextCollectionDate;

Answer 1

//diff in msec
long diff = currentDate.getTime() - nextCollectionDate.getTime();

//diff in days
long days = diff / (24 * 60 * 60 * 1000);