You can found many posts with the same problem "Time zone +1 after restart":
Redmi Note LTE - Time Zone Drop after Reboot
Time is different
[ROM MIUI KK v6] - sMIUI 5.1.3 <<< AROMA,initd,tdb,multilang,zipalign,cpuTweaks >>>
[ROM MIUI KK v6] - sMIUI 5.1.3 <<<...