Hey @Waqkas-Ahmed ,
Have you tried the old school control panel interface? On my lab machines, after granting the 'change system time' user right through group policy, and restarting the machine, I found that the new interface through Windows 10 settings > Date and Time, hadn't changed (no apparent way to change the time). But when I clicked Additional date, time, & regional settings (which opens Control Panel > Clock and Region) link on the right, then clicking 'Set the time and date' (which opens the 'Date and Time' dialog box (the one with the image of a clock face), the user was able to change the time.
**if the post above has answered the question, please mark the topic as solved.