Convert different DATE format to unique date format using python

How to convert date format dynamically using python

import pandas as pd
import datetime

df = pd.read_csv('G:\ETL_Automation\data\date1.txt')
print(df.dtypes)

df1 = df.apply(lambda col: pd.to_datetime(col, errors='ignore')

 if col.dtypes == object else col, axis=0)

for col in df1.filter(regex='date'):
    try:
        df1[col] = pd.datetime(df1[col])
    except TypeError:
        df[col] = pd.to_datetime(df1[col], format='%YYYY-$m-%d')

print(df)

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