Error : strptime() argument 1 must be str, not int

I am trying to substract two times and getting an error. In below total error is coming up

if result[0]['outTime'] != None:
type = "bothPunchDone"
FMT = '%H:%M:%S'
total= datetime.strptime(result[0]['outTime'], FMT) - datetime.strptime(result[0]['inTime'], FMT)

I tried but not able to solve the issue.

from datetime import datetime

result = datetime.now().strftime("%H:%M:%S")

if result != None:
    type = "bothPunchDone"
    
FMT = '%H:%M:%S'
total= datetime.strptime(result, FMT) - datetime.strptime(result, FMT)

print(total)