ISO 8601 Keyboard for iPhone, iPad, and iPod touch is a keyboard that types in the YYYY-MM-DD format. This app types yesterdays, todays, and tomorrows date.
SMART BACKSPACE
The backspace key, while staying inside the ISO 8601 Keyboard, will delete the last item typed. If a date was typed last and the backspace button is tapped, the entire date will be deleted.
LIGHTWEIGHT THIRD-PARTY KEYBOARD
This app uses the minimal amount of resources needed, which provides peak performance. The keyboard does NOT require "full access."