Hi:
For whatever reason they do it, HP starts the warranty clock ticking the minute the PC leaves the assembly plant.
So the more time the PC sits unsold, the less time remains on the warranty.
Watch the video below for how to get the warranty start and end dates adjusted.
How to Submit a Dispute to Validate Your Warranty | HP Support | HP - YouTube
Here is the link to the online warranty dispute form...
HP PCs, printers - Dispute a warranty status | HP® Customer Support
Here is the link to contact HP customer service in India...
Contact HP | HP® India