The warranty period starts from the date of delivery of the goods to the consumer, meaning the date on the invoice is considered as the starting date of the warranty. Depending on the brand of your laptop or desktop product, you can inquire about the warranty period online. Brands offer this inquiry based on the serial number or product number, or you can use a tool installed on the computer you want to check to perform the inquiry.
As far as I can determine, here are some major brands that offer the possibility of online warranty inquiry:
HP Warranty Checker
Click here to access the warranty Checker page.
DELL Warranty Checker
Click here to access the warranty Checker page.
LENOVO Warranty Checker
Click here to access the warranty Checker page.
Acer Warranty Checker
Click here to access the warranty Checker page.
Asus Warranty Checker
Click here to access the warranty Checker page.
Click here to access an alternative warranty Checker page.
Apple Warranty Checker
Click here to access the warranty Checker page.
MSI Warranty Checker
Click here to access the warranty Checker page.
Huawei Warranty Checker
Click here to access the warranty Checker page.
Toshiba (Dynabook) Warranty Checker
Click here to access the warranty Checker page.
Samsung Warranty Checker
Click here to access the warranty Checker page.