date and time

Hello,  i am having a problem with the clock on my computer. The time zone is correct for my place of residence, but i was  surprised twice that the clock is wrong, it is a full hour ahead of the correct time in my country... i corrected the clock manually and made sure that the time zone is correct... but i had the same problem again after two days. i  asked Microsoft support but they couldn't find the solution.

so please help me if you  had the same problem or know How  to fix it.