datetime: update xml

- rename 'GetAllZoneSummary' to 'GetAllZoneInfo'

tower: https://tower.im/projects/8f19f0bf0e754f0b82ef2c24bc230973/todos/d1c364af66c647b184b35f72d3d87e46/

Change-Id: I40bdb82171d8da89500c5ea03a9136cc4074fcd2