I am given this 1974-11-27T00:00:00
but I don't know what you call this format so I can't find anything online on how to make this yyyymmdd
That's called an ISO formatted date time string. You can turn that into a datetime object by just doing:
import datetime
example = '1974-11-27T00:00:00'
d = datetime.datetime.fromisoformat(example)
Now that's it's a date-time object, you can format it however you want:
print(d.strftime('%Y%m%d'))
>> 19741127