import pandas as pd
import datetime
 
df=pd.read_csv(r'C:\Users\User\Desktop\iii.csv', header=None, names=['A','B','C'], dtype={'B':str})
print(df)


bl = len(df.B)
for i in range(0,bl):
    x1 = df.B[i]
    if  x1[8] == "2" and x1[9] == "4":
        x1[8].replace('2','0',inplace=True)
        x1[9].replace('4','0',inplace=True)
        print(df.B[9])
        break
    
def convertDateStr(value):
    return datetime.datetime.strptime(value, "%Y%m%d%H").strftime("%Y-%m-%d %H:%M:%S.000")
 
df.B = df.B.apply(convertDateStr)