Get time before of fft block

I’m a new user of gnuradio.
I want to use this software to analyze a traffic on wifi channels.I
have a
usrp2 hardware and I use the program file to capture and
save into a file the result frequency and amplitude. The problem is :
can I get the time data sampling (in the simpler I think) that occurs
to FFT ?
PS: sorry for my english and thanks.

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