QDateTime

linyang

用了这么多次QDateTime竟然没有注意时区的问题
QDateTime dt = QDateTime::fromString("2015-08-20 10:45:20", "yyyy-MM-dd hh:mm:ss");//此处使用的是本地时区
uint secs = dt.toTime_t();//获取的时间会比实际时间少8小时 因为这边使用的UTC时区
dt.setTimeSpec(Qt::UTC);
secs = dt.toTime_t();//这样才是正确结果

以上是我的理解 如有不对 欢迎指点

sywh

QDateTime can store datetimes as local time or as UTC. QDateTime::currentDateTime() returns a QDateTime expressed as local time; use toUTC() to convert it to UTC. You can also use timeSpec() to find out if a QDateTime object stores a UTC time or a local time. Operations such as addSecs() and secsTo() are aware of daylight saving time (DST).