def make_full_path(time):
    """Return a valid ftp download url based on a date input
    """

    year, month, day = time.year, time.month, time.day

    return (
        "ftp://my.cmems-du.eu/Core/SEALEVEL_GLO_PHY_L4_REP_OBSERVATIONS_008_047/"
        f"dataset-duacs-rep-global-merged-allsat-phy-l4/{year}/{month:02d}/"
        f"dt_global_allsat_phy_l4_{year}{month:02d}{day:02d}_20190101.nc"
    )