[Python] Python 3 Convert ISO 8601 to milliseconds

I'm receiving an ISO 8601 format from an API GET request ("2020-02-25T00:02:43.000Z"). I'm trying to convert it to milliseconds, because that format is required in the payload of the API POST call. I've been successful running the code from a Linux system, but I get ValueError: Invalid format string from Windows.

From Linux:

import dateutil.parser

time = "2020-02-25T00:02:43.000Z"
parsed_time = dateutil.parser.parse(time)
t_in_millisec = parsed_time.strftime('%s%f')
t_in_millisec[:-3]


returns

'1582588963000'


From Windows:

import dateutil.parser

1 time = "2020-02-25T00:02:43.000Z"
2 parsed_time = dateutil.parser.parse(time)
----> 3 t_in_millisec = parsed_time.strftime('%s%f')

ValueError: Invalid format string


Is there a way around this?

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