On the site https://million-estates.com.ua/ the Homey theme is installed https://favethemes.zendesk.com/hc/en-us/categories/360003815552-Homey
1. In the admin panel, there is a function to set the price for any period, for example, from January to March the price per night is 10€, and from April to June the price per night will be 30€, but it is also necessary to add fields for setting the price for 6 -13 nights, 14-30 nights, 30 nights +

This is how the table with periods looks

2. It is also necessary to add a field with the price for the year

3. These fields need to be calculated when the client selects days, for example, if they select days in 2 periods, then it is calculated separately for each, and add a checkbox for the year, and then it shows the price for the year

4. It is necessary to replace the columns Original, Additional guests and add new ones with fields for the price per day for 6 -13 nights, 14-30 nights, 30 nights + in the object card

Theme file
https://drive.google.com/file/d/1_v80_pZeMvEWIv1DlzbG7QFt6BwqyiUD/view?usp=drive_link