[CheckIO][Scientific Expedition] Latest-iso-datetime

1. Problem: https://py.checkio.org/en/mission/latest-iso-datetime/
2. My solution 

import datetime 
def get_latest(dt1str: str, dt2str: str) -> str:
    time_comparison = []
    # your code here
    for date in [dt1str, dt2str]:
        dummy_data = date.split('-')
        dummy_data[0] = str(int(date.split('-')[0])+3000)
        convert_to_unix_time = datetime.datetime.strptime("-".join(dummy_data), "%Y-%m-%dT%H:%M:%S").timestamp()
        time_comparison.append(convert_to_unix_time)
   
    
    if time_comparison[0] > time_comparison[1]: return dt1str
    else: return dt2str