"Ships in 3-5 business days" is not a date. Shoppers have to do the arithmetic, and they get it wrong. This puts the date itself on the product page: "Estimated delivery: Thu, 10 Sep - Tue, 15 Sep". It comes from your processing time, shipping range and daily cutoff, skipping weekends and the holidays you list. The clock is your store's, not the visitor's. Only the UTC offset comes from the page, so a cached page cannot freeze the cutoff countdown.
Picklists, schedules and multi-location inventory for retail...
In store pickup and local delivery date picker & time...
Order delivery date picker & store pick-ups for food/florists...
Optimize local delivery routes with driver app & notifications...