from datetime import datetime

def get_date_interval_from_get(request):
    """
    Parses a request and returns the start and end date from it.

    Parameters
    ----------
    request: The GET Request Object

    Returns
    -------
    Return a tuple in the form of (start_date, end_date). If either the start date or the end date is not present in the request None is returned in the tuple
    """
    
    start_identifier = ['start', 'start_date', 'from']
    end_identifier = ['end', 'end_date', 'to']
    start = next((identifier for identifier in start_identifier if identifier in request.GET), None)
    end = next((identifier for identifier in end_identifier if identifier in request.GET), None)

    if start:
        try:
            start = datetime.strptime(request.GET.get(start), '%Y-%m-%d').date()
        except ValueError:
            start = None
    if end:
        try:
            end = datetime.strptime(request.GET.get(end), '%Y-%m-%d').date()
        except ValueError:
            end = None

    return start, end