import pandas as pd df = pd.DataFrame({'DOB': {0: '26/1/2016 ', 1: '26/1/2016 '}) print(df.dtypes) df['DOB1'] = df['DOB'].dt.strftime('%m/%d/%Y') print(df.dtypes) df['DOB1'] = pd.to_datetime(df['DOB1']) print(df.dtypes)