How to create a condition for filtering?

Question

SQL

Table:

UI:

Condition:

Array
(
    [day_1] => 1
    [month_1] => 1
    [year_1] => -1000
    [day_2] => 10
    [month_2] => 2
    [year_2] => -12
)

    SELECT events.id, events.name as event_name, events.date_start, events.date_end, events.country_id, events.description, events.day_1, events.day_2, events.month_1, events.month_2, events.year_1, events.year_2, countries.name as country_name, countries.cluster, links.links, images.images FROM events
    LEFT JOIN countries ON events.country_id = countries.id
    LEFT JOIN (SELECT event_id, GROUP_CONCAT(link) as links FROM links GROUP BY event_id) AS links ON events.id = links.event_id
    LEFT JOIN (SELECT event_id, GROUP_CONCAT(name) as images FROM images GROUP BY event_id) AS images ON events.id = images.event_id
    WHERE (events.year_1 >= :year_1 && (events.month_1 >= :month_1 || events.month_1 IS NULL) && (events.day_1 >= :day_1 || events.day_1 IS NULL)) AND (events.year_1 <= :year_2 && (events.month_2 <= :month_2 OR events.month_2 IS NULL) && (events.day_2 <= :day_2 OR events.day_2 IS NULL)) 
    ORDER BY events.year_1, events.month_1, events.day_1 asc
    LIMIT 30

It is not possible to compose a condition in such a way that unfilled fields (NULL) participate in the selection and are normally sorted - asc, desc.
Plus, the first element on the UI is not sorted - asc, desc.
The fields are filled according to the mask: dd.mm.yyyy || dd.mm.-yyyy
Can only be specified as the lower or upper date limit.