常用时间处理

获取上周时间段

 LocalDate localDate = LocalDate.now();
        localDate = localDate.plusDays(-1);
        LocalDate startTime = localDate.with(DayOfWeek.MONDAY);
        LocalDate endTime = localDate.with(DayOfWeek.SUNDAY);

LocalDate转Date
1）使用ZonedDateTime将LocalDate转换为Instant。
2）使用from（）方法从Instant对象获取Date的实例

 ZoneId zoneId = ZoneId.systemDefault();
        LocalDate localDate = LocalDate.now();
        ZonedDateTime zdt = localDate.atStartOfDay(zoneId);

        Date date = Date.from(zdt.toInstant());

时间戳转时分秒

export const getTimeValue = (start, end)=>{
    var stime =new Date(start).getTime();
    var etime = new Date(end).getTime();
    var usedTime = etime - stime;  //两个时间戳相差的毫秒数
    var days=Math.floor(usedTime/(24*3600*1000));
    //计算出小时数
    var leave1=usedTime%(24*3600*1000);    //计算天数后剩余的毫秒数
    var hours=Math.floor(leave1/(3600*1000));
    //计算相差分钟数
    var leave2=leave1%(3600*1000);        //计算小时数后剩余的毫秒数
    var minutes=Math.floor(leave2/(60*1000));
    // var time = days + "天"+hours+"时"+minutes+"分";
    var time = days;
    return time;
}