df_local_to_utc.py

    # validate dt column exits
    assert "dt_local" in df.columns.tolist()
    # make sure is a dt column
    df["dt_local"] = pd.to_datetime(df["dt_local"])
    # set to local time (Europe/Madrid)
    s_local_time = "Europe/Madrid"
    df["local"] = df["dt_local"].dt.tz_localize(s_local_time, ambiguous=True)
    # conversion local to UTC
    df["dt_utc"] = df["local"].dt.tz_convert("UTC")
    # to dt
    df["dt_utc"] = pd.to_datetime(df["dt_utc"])
    df["dt_utc"] = df["dt_utc"].dt.tz_localize(None)
    # remove local 
    df.drop("local", axis = 1, inplace=True)