Crash with date setting in Home Settings

[TravisE]

I encountered the following crash when activating the calendar widget on the Home Settings screen of my physical Prime (2018-02-12 13441):

1. Go to Page 2 of Home Settings and select the date field
2. Type something like “2018/01/01” and press ENTER. The field now displays “----/--/--”
3. Tap the calendar icon next to the field. The system reboots.

By the way, it's quite counterintuitive that the date field doesn't accept input typed in the very format it displays. It turns out that it wants YYYY.MMDD, but there's no obvious indication in the UI of this fact.