How to add days,hours and minutes to QDataTime

mark_ua_1999

Hi I am trying to change my data adding 2 days and 300 seconds but my code dont work do you have any ideas how to resolve it thanks.
QString format = "yyyy-MM-dd HH:mm";
QDateTime a1 = QDateTime::fromString("2017-11-19 12:49", format);//час в дорозі

 a1.addDays(2);
 a1.addSecs(300);
// a2.addSecs(time[time.size()-i].toInt()+500);
 QString s = a1.toString(format);
// QString s1 = a2.toString(format);
 ui->textBrowser->append(s);```

//your code here

JonB

@mark_ua_1999

 a1.addDays(2);
 a1.addSecs(300);

Look at the documentation. These are functions returning a new QDateTime, they do not change the a1 value.

 a1 = a1.addDays(2);
 a1 = a1.addSecs(300);

mark_ua_1999

@JNBarchan thanks for your help