Change date format for better 'ja' compatibility am: 83f4bc398e am: c3e75d31e6 am: 256df9ea88

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/12345066

Change-Id: Ic6e9ad8b582edb308a70ac3049d9075154f76800