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java - 如何计算两次之间的差异

问题描述

我想计算用户的睡眠时间，他应该在他睡觉和醒来时进入，我应该计算他睡了多少小时

例如，如果用户输入

His sleeping time : 11:00 pm

His waking up time : 7:30 am

The number of sleeping hours should be : 8:30 hrs

有什么方法可以轻松进行此计算

这是代码

cal.set(Calendar.HOUR_OF_DAY, 11);
        cal.set(Calendar.MINUTE, 0);
        sleepTimeOnOffDays = cal.getTime();

    private long subtractTwoDates(Date date1, Date date2) {

            Calendar calendar1 = Calendar.getInstance();
            Calendar calendar2 = Calendar.getInstance();
            calendar1.setTime(date1);
            calendar2.setTime(date2);
            long milsecs1 = calendar1.getTimeInMillis();
            long milsecs2 = calendar2.getTimeInMillis();
            long diff = milsecs2 - milsecs1;
            long dhours = diff / (60 * 60 * 1000);

            return Math.abs(dhours);
        }

标签： javaandroiddatecalendar

解决方案

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