Hi @Фазиль, welcome to our forum!
Your question has been translated to English as this is an International forum.
The warranty starts the day the device is purchased, so if you take a look at the date on your receipt/warranty card and then you can find the warranty terms for your market on the link below (choose your country under "Warranty") and you can see how long the warranty is valid. It's usually 12 or 24 months, depending on where you live.
https://support.sonymobile.com/global-en/xperiaxz2/supportDocumentation/
You can also get in touch with your Local support team and they will be able to provide you with this information.
Let me know if that helps! 
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