def scopus_zip_file_name_date_edit(scopus_zip_file_name):
    
    """
    The original scopus_zip_file_name is returned with date in the format YYYY-M-D
    We would like to change the date format to YYYY-MM-DD so that file name order is maintained.
    
    Argument(s):
    scopus_zip_file_name: (str) Name extracted at the end of this email parser
    
    Output(s):
    scopus_zip_file_name: (str) Edited name with corrected date format.
    
    """
    old_format = 'YYYY-M-D'
    match_pattern_index = scopus_zip_file_name.index('_ANI-ITEM')
    date_field = scopus_zip_file_name[(match_pattern_index-len(old_format)):match_pattern_index]

    first_part = scopus_zip_file_name[:(match_pattern_index-len(old_format))] 
    last_part = scopus_zip_file_name[match_pattern_index:]
    
    date_field = date_field.split('-')
    date_field[1] = date_field[1].zfill(2)
    date_field[2] = date_field[2].zfill(2)
    date_field = ('-').join(date_field)
    
    scopus_zip_file_name = first_part + date_field + last_part
    
    return scopus_zip_file_name