ARIA Date Picker (with Editable Tooltip Comments)

The calendar is keyboard accessible:

• When the calendar is opened, focus is set on the current date.
• Press the Left and Right arrow keys to navigate the row by week day.
• Press the Home and End keys to jump to the beginning or end of the current row.
• Press the Up and Down arrow keys to navigate between weeks on the same week day.
• Press the PageDown and PageUp keys to navigate backwards or forwards by month.
• Press Alt+PageDown and Alt+PageUp to navigate backwards or forwards by year.
• Press the Enter key to activate the selected date.
• Press Escape to close the calendar without making a selection.
• Mouse users can click the desired date buttons as usual.