Modification of the default time zone

The time zone support list can be viewed in frameworks/base/packages/SettingsLib/res/xml/timezones.xml.

Temporary modification method

• System readable and writable

  adb shell setprop persist.sys.root_access 3
  adb root
  adb remount

• Modify the value of persist.sys.timezone in the /system/build.prop file (Android10 and above: /vendor/build.prop)

  • Asia/Shanghai：UTC+8

• System restart

  adb shell reboot

Code modification method

• Android7.1/Android10
  • In the file device/rockchip/CPU_TYPE/PRODUCT_TYPE/system.prop, modify the value of persist.sys.timezone
    • Asia/Shanghai：UTC+8
• Android11 and above
  • Add the following content in the device/rockchip/CPU_TYPE/PRODUCT_TYPE/PRODUCT_TYPE.mk file:

  PRODUCT_PROPERTY_OVERRIDES += persist.sys.timezone=Asia/Shanghai

• Delete build.prop in the out directory

  rm out/target/product/PRODUCT_TYPE/obj/ETC/system_build_prop_intermediates/build.prop