FOR ALL DEVICES

SET TIME/DATE ANDROID 4 VERSIONS
From device home screen>click settings>other>more settings>date & time>select your time zone>tick automatic time and date>return to your home screen

SET TIME/DATE ANDROID 5 AND 6 VERSIONS
From device home screen>click settings>on the 2nd row (preferences) click more settings>scroll down-click date & time>select your time zone>tick automatic time and date>return to your home screen

SET TIME/DATE ANDROID FIRESTICKS & FIRE TV BOXES
From device home screen>click settings>system>time zone>select your time zone>return to your home screen

If for some reason your date/time will not stick, restart your router and device, if still the same then try clock sync app 

CLOCK SYNC APP DIRECT DOWNLOAD  << CLICK HERE