[Python] Parse_dates in Pandas

The following code can't parse my date column into dates from csv file.

data = pd.read_csv('c:/data.csv', parse_dates=True, keep_date_col=True)


or

data = pd.read_csv('c:/data.csv', parse_dates=[0])


data is like following

date value
30MAR1990 140000
30JUN1990 30000
30SEP1990 120000
30DEC1990 34555


What did I do wrong?

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