java - 以毫秒为单位比较日期

Question

假设我有两个日期字段 receiveDate 和 currentDate。我想检查 receiveDate 是否比 currentDate 早 5 天。我所做的是以毫秒为单位转换日期，然后与 5 进行比较。有没有更好的方法呢？如果是这样，我的如何以及为什么更好？谢谢。

我写的方法-

private static final double DAY_IN_MILLISECONDS = 86400000;

// Param date is the receivedDate
private long getDaysOld(final Date date) {


    Calendar suppliedDate = Calendar.getInstance();
    suppliedDate.setTime(date);
    Calendar today = Calendar.getInstance();
    today.setTime(currentDate);

    double ageInMillis = (today.getTimeInMillis() - suppliedDate.getTimeInMillis());
    double tempDouble;

    if(isEqual(ageInMillis, 0.00) || isGreaterThan(Math.abs(ageInMillis), DAY_IN_MILLISECONDS)) {
        tempDouble =  ageInMillis / DAY_IN_MILLISECONDS;
    } else {
        tempDouble =  DAY_IN_MILLISECONDS / ageInMillis;
    }

    long ageInDays = Math.round(tempDouble);

    return ageInDays;


}

然后我有类似的东西-

long daysOld = getDaysOld(receivedDate) ;   
if(daysOld <= 5) {
    .... some business code ....
}

Answer 1

尝试joda-time .使用 native API 的时间计算充其量总是令人尴尬的。 Joda 时间使这种类型的计算 MUUUCH 变得更加简单，并且还能很好地处理时区。