Lambda function error

[localsystemuser]

First of all: I am not familiar with Python, so I am asking for help to fix the existing script. There is a Python script (Lambda function) for deleting files having time stamps from S3 bucket:
https://gist.github.com/pwilken/b548b589...9ebadae59f

However it is failing at:

Error:
    [ERROR] IndexError: list index out of range
    Traceback (most recent call last):
      File "/var/task/lambda_function.py", line 34, in lambda_handler
        hour = dateArray[1].split(":")[0]

time stamp in S3 looks like: Jan 27, 2020 4:36:02 PM GMT+0000

so it is probably not expecting year here:

            # Start Policy for everything older then one week
            date = obj["Key"].replace('prefix_before_time', '')
            dateArray = date.split("T")
            date = dateArray[0]
            hour = dateArray[1].split(":")[0]
            print(f'  {date} - {hour}')

Do anyone know how to fix it?