How can a fixed availability date be specified in the delivery time for the product?

Firstly, a new additional field must be created on the product (e.g. acris_arrival_date). The availability date on the product is saved in this field. Then a new delivery time must be created under Settings > Shop > Delivery times and assigned to the product. The name of the delivery time can be:

‘Not in stock.{% if product.translated.customFields.acris_arrival_date %} Available approx. from {{ product.translated.customFields.acris_arrival_date|date(’d.m.Y") }}{% endif %}.’