掌握七日周期：获取时间范围与日常操作-优快云博客

本文链接：https://blog.youkuaiyun.com/chali1314/article/details/121492630

本文介绍了如何获取当天的开始和结束时间，以及如何计算并返回过去七天的时间范围。通过Calendar实例和时间格式化，展示了实用的日期计算技巧。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

获取当天的开始时间

Calendar todayStart = Calendar.getInstance();
todayStart.set(Calendar.HOUR, 0);
todayStart.set(Calendar.MINUTE, 0);
todayStart.set(Calendar.SECOND, 0);
todayStart.set(Calendar.MILLISECOND, 0);
todayStart.set(Calendar.AM_PM, Calendar.AM);
return TIME_SDF.format(todayStart.getTime());

获取当天的结束时间

Calendar todayStart = Calendar.getInstance();
todayStart.set(Calendar.HOUR, 23); 
todayStart.set(Calendar.MINUTE, 59); 
todayStart.set(Calendar.SECOND, 59); 
todayStart.set(Calendar.MILLISECOND, 999); 
todayStart.set(Calendar.AM_PM, Calendar.AM); 
return TIME_SDF.format(todayStart.getTime());

获取最近7天的开始时间和结束时间

/**
     * 获取近七天的开始和结束日期
     * @return
     */
    public static ScanTimeBean getSevendayTimeBean(){
        Calendar now = Calendar.getInstance();
        String endTime = TIME_SDF.format(now.getTime());
        now.set(Calendar.DAY_OF_YEAR, now.get(Calendar.DAY_OF_YEAR) - 6);
        now.set(Calendar.HOUR, 0);
        now.set(Calendar.MINUTE, 0);
        now.set(Calendar.SECOND, 0);
        now.set(Calendar.MILLISECOND, 0);
        now.set(Calendar.AM_PM, Calendar.AM);
        String startTime = TIME_SDF.format(now.getTime());
        ScanTimeBean tb = new ScanTimeBean();
        tb.setStartTime(startTime);
        tb.setEndTime(endTime);
        return tb;
    }