def create_dates(df, date='Check-In'):
    """
    Split date into year, month, day and day of year
    df = DataFrame
    date = put date column. Default is 'Check-In'

    In week, Monday is 0 and Sunday is 6. 
    """
    df['Mes'] = df[date].dt.month
    df['Dia'] = df[date].dt.day
    df['Semana_do_ano'] = df[date].dt.week   
    return df