Importing a particular range of data in datetime format

I have a following excel data named 'm' and in the second sheet i want to import the time series in datetimeformat.

A                  B          C;
12/28/2015 17:13  6.14E-08  1.48E-07;
12/28/2015 17:23  1.47E-07  3.44E-07;
12/28/2015 17:33  6.25E-08  1.51E-07;
12/28/2015 17:43  1.49E-07  3.51E-07;
12/28/2015 17:53  1.53E-07  3.63E-07;

I want to import the collumn A (timeseries). For the same i use following xlsread but i get a null matrix

 timee=datetime(xlsread('m','No distribution','A2:A5'));

Kindly help , how can i import collumn A in datetimeformat.