BeginReadMultiSample looking for timestamp

I am sampling analog data from 2 ni 9222 with the Measurement-Framework.

I begin reading with BeginReadMultiSample and getting all data well with EndReadMultiSample.

Question:

Is there a way to get the timestamp of the first sample in the double[,] array

given by EndRead inside the callback ?

Thanks for any help,

Ralf