On this page there’s 2 highlights (view in Baymard Premium) outlining what Booking.com are doing right and wrong.
(Tip: use the arrows above or on your keyboard to navigate all 37 date picker examples.)

The screenshot was taken on January 5, 2022 and depicts Booking.com’s Date Picker. In total, we’ve reviewed 35 of Booking.com’s page designs. To see them all, visit the full Booking.com UX case study.