IndexError: index out of bounds

[LeoGER]

I have replaced:

days = ['mon', 'tues', 'wed', 'thur', 'fri', 'sat', 'sun']

with:

days = ['monday', 'tuesday', 'wednesday', 'thursday', 'friday', 'saturday', 'sunday']

However, I am getting the following ErrorMessage:

Error:
Traceback (most recent call last):
  File "bikeshare.py", line 238, in <module>
    main()
  File "bikeshare.py", line 219, in main
    trip_duration_stats(df)
  File "bikeshare.py", line 161, in trip_duration_stats
    print('Total Travel Time: ', seconds_to_datestamp(df['Trip Duration'].sum()))
  File "bikeshare.py", line 145, in seconds_to_datestamp
    seconds = seconds - (days * seconds_in_day)
TypeError: ufunc 'subtract' did not contain a loop with signature matching types dtype('<U10') dtype('<U10') dtype('<U10')