[Python] Pandas to_datetime parsing error: Unknown string format

I have a column in my pandas dataframe:

Start Date
1/7/13
1/7/13
1/7/13
16/7/13
16/7/13


When I convert it into a date format, I am getting the following error:

data['Start Date']= pd.to_datetime(data['Start Date'],dayfirst=True)
...
...
/Library/Python/2.7/site-packages/pandas/tseries/tools.pyc in _convert_listlike(arg, box, format, name)
381 return DatetimeIndex._simple_new(values, name=name, tz=tz)
382 except (ValueError, TypeError):
--> 383 raise e
384
385 if arg is None:

ValueError: Unknown string format


What am I missing here?

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