函数Mjd2cal实现MJD格式到世界时格式的时间转换

void mjd2cal(double utc,int& year,int& mon ,int& day,int& hour,int& min,double& sec)

{    
     

    if(utc>2400000.5){    
     

        utc = utc - 2400000.5;

    }

    int i,j,k,l,idy;

    double sfrac;

    idy = (int)utc - 33282;

    i = (4000*(idy   18204))/1461001;

    j = idy - (1461 * i)/ 4   18234;

    k = 80 * j/2447;

    l = k/11;

    year = 1900 l i;

    mon = k 2-12*l;

    day = j-(2447*k)/80;

    sfrac = (double)(utc-int(utc))*24.0;

    hour = (int)sfrac;

    sfrac = (sfrac -(double)hour) *60.0;

    min=(int)sfrac;

    sec = (sfrac-(double)min)*60;

    return;

}

结果验证： int year=0,mon=0,day=0,hour=0,min=0;

    double sec=0;

    double utc= 59539.5;

    mjd2cal(utc,year,mon,day,hour,min,sec);

    qDebug()<<year<<mon<<day<<hour<<min<<sec;

结果: 2021 11 21 12 0 0