Scripting

What version are you on? I think in version 9.0 we added warranty support for HP and Lenovo

https://support.quest.com/kace-systems-management-appliance/kb/259176/how-to-configure-hp-and-lenovo-warranty

However, HP is currently having issues on their end with their HP Warranty API. 

This feature is currently unavaiable because HP disabled the API to read out these informations from their database.
See here: https://support.quest.com/kb/282650

Find a way how to read out the info (over the web page or similar) and create a custom inventory rule.

the fourth character of the serial number is manufacturing year (modulo 10) and the 5th and 6th the week in this year.

You can create a repport with something like :

SELECT  distinct NAME
	,SUBSTRING(BIOS_SERIAL_NUMBER,4,1)+2010
FROM
	MACHINE
	Where CS_MANUFACTURER = 'Hewlett-Packard'