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Hi Long,

thanks for your answer. I'm probably doing something wrong, because the result isn't filtered:

$connected = new WP_Query( [
    'relationship' => [
    'id'   => 'fromdatestovenues',
    'to' => get_the_ID(),
    'meta_key'   => 'wochentag_select',
    'meta_value' => $dertag,],
    'nopaging'     => true,
] );

doesn't show any posts:

$connected = new WP_Query( [
    'relationship' => [
    'id'   => 'fromdatestovenues',
    'to' => get_the_ID(),
        ],
    'meta_key'   => 'wochentag_select',
    'meta_value' => $dertag,
    'nopaging'     => true,
] );

Is it relevant that the custom field is not in the post I'm running the query from, but in the post with the relationship?

In Views (Singleview) the working query is:

{% for post in relationships.fromdatestovenues.from|filter(post => post.wochentag_select.name == dertag or post.wochentag_select.name == heute)|sort((a, b) => b.wochentag_select <=> a.wochentag_select ?: a.startzeit <=> b.startzeit) %}

But I have to rewrite it to php.