Start with the order date or shipment start date
Add the processing time
Add the shipping transit time
Add any handling or packaging time
Add any warehouse or fulfillment delay
Add any custom production time if applicable
Add any weekend exclusion rules if delivery does not occur on weekends
Add any holiday exclusion rules if delivery does not occur on holidays
Add any cutoff time adjustment if the order was placed after the daily cutoff
Add any carrier-specific delay buffer if needed
Check the destination zone or distance for transit estimates
Confirm the final date against the carrier’s estimated delivery schedule