It global standard for all product warranties based on a fixed period of time starting from the purchase date of the unit. Duration of warranties are specific to each product. If proof of purchase cannot be obtained, the warranty duration is calculated from the manufacture date of the unit. Each of the respective manufacturer supplier had their warranty status tool and mean to found out product factory warranty coverage.
In short warranties start on purchase date, not delivery date is the norm for most of the case. These are terms, you are agreeing to those terms when you make the purchase. For cases required extended warranty or special insurance to cover the gap, feel free to contact our officer for a special commercial quote in context.