fix(date): add placeholder and additional format option

[henten20]

Before submitting a pull request, please make sure the following is done:

1. Fork the repository and create your branch from master.
2. Run yarn in the repository root.
3. If you've fixed a bug or added code that should be tested, add tests!
4. Ensure the test suite passes (yarn test). Tip: yarn test --watch TestName is helpful in development.
5. Make sure your code passed the conventional commits check. Read more about conventional commits

[codecov[bot]]

Codecov Report

Merging #1284 (681df8d) into master (27f2767) will decrease coverage by 4.07%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1284      +/-   ##
==========================================
- Coverage   95.67%   91.60%   -4.07%     
==========================================
  Files          19        8      -11     
  Lines         855      274     -581     
  Branches      282       94     -188     
==========================================
- Hits          818      251     -567     
+ Misses         37       23      -14     

Impacted Files	Coverage Δ
packages/date/src/DateField.js	100.00% <ø> (ø)
packages/date/src/Date.js	93.15% <100.00%> (ø)

... and 25 files with indirect coverage changes