date property Null safety

1. baguette
2. CalendarTileWidget
3. CalendarTileWidget
4. date property

CalendarTileWidget class

1. Constructors
2. CalendarTileWidget
3. Properties
4. border
5. color
6. date
7. hashCode
8. key
9. rect
10. runtimeType
11. textColor
12. Methods
13. createElement
14. createState
15. debugDescribeChildren
16. debugFillProperties
17. noSuchMethod
18. toDiagnosticsNode
19. toString
20. toStringDeep
21. toStringShallow
22. toStringShort
23. Operators
24. operator ==