Help with assessing the correct dates for time series in MATLAB

First of all i am fairly new with MATLAB

I have a single time series for unemployment from 1971 quarter 1 to 2013 quarter 1, hence the frequency of the timeseries is quarterly.

I imported the series from an excel file, but when converting the vector to a timeseries object i have a problem of assessing the corect year and quarter to the different values in the timeseries. Help would be much appreciated !