Deprecation warning: Even if running the example

[irvingsl]

First of all, congratulations for your AMAZING lib, it was very useful and easy to use to me.

I'm receiving a deprecation warning beacause of holidays, that says about the date format, that should be ISO or RFC2822, i tried both format, but it's not working (I tried setting today as a holiday), and even the warning don't gone away.
The only format that works is the one in the example: YYYY/MM/DD.

I'm pretty new in JS/React libs, but that will be a pleasure if you can guide me to help you improve that...

[stefanoTron]

Thanks for the nice comment.

This warning comes form the underlying moment.js lib, which handles the string to date conversions. As of my understanding, when evaluating the holiday dates, we should explicitly provide a date format or multiple formats: moment("12-25-1995", ["MM-DD-YYYY", "YYYY-MM-DD"]);

The best solution, I think, would be to provide a date format in the config file, like it's done for the timezone. So the user could provide the holiday dates in the corresponding format.

You can send a PR, or I'll find some time in the near future to do it myself