Larkis Date Time Picker lets customers choose a delivery, pickup, or reservation date and time directly in your store. It supports multiple locations, custom time slots, preparation time, blackout dates, and cutoff times. The widget works on cart pages, product pages, and as a floating button or popup. Merchants can set different schedules per day of the week, limit orders per time slot, and block out busy dates. Saves to cart attributes automatically and integrates with any Shopify theme.