Formatting Date in Javascript as yyyy-mm-dd and passing it in Kettle

Question

How do I return yesterday day in the format of yyyy-mm-dd using JavaScript and using the regular expression below.

((19|20)\d\d)-(0?[1-9]|1[012])-(0?[1-9]|[12][0-9]|3[01])

Answer 1

Native JS date formatting is very primitive (see this question for more details).

If you can, a better solution is to use Moment.js to make working with dates in JS much, much better.