from datetime import datetime


def georgian_day(date):
    """ Returns the number of days passed since the start of the year.

    :param date:
        The string date with this format %m/%d/%Y
    :type date:
        String

    :returns:
        int

    :example:
        >>> georgian_day('05/1/2015')
        121
    """
    try:
        fmt = '%m/%d/%Y'
        return datetime.strptime(date, fmt).timetuple().tm_yday
    except (ValueError, TypeError):
        return 0