[Qgis-developer] datetime difference between 2 datetimes in Field Calculator

[Richard Duivenvoorde]

I have a start-datetime (string) and a an end-datetime (string) in the 
attributes of my vector data.

I can use the  to_datetime(str) function in the Field Calculator to 
create DateTime objects from these.

But now it would be cool to check the time-difference between those two 
(called timespan?).
I did not find a function for those...

Any hints?

If I did not miss something, I think there is not even a Qt function for 
this...

A function to add could be: 'to_timemillies', then the user could create 
timemillies from the DateTime-objects, and do some calculation on those 
him/herself...

Would that be usefull?

Regards,

Richard Duivenvoorde