Hi Tuomas.

I've just published v1.4.1 to npm, please make sure you update to that, it won't include it's own momentjs any more.

If you want to use a custom locale, simply require the appropriate momentjs locale before require-ing react-date-picker

Example:

//make sure you require this first!
var nl = require('moment/locale/nl')

//and then require the date picker - it will use the locale you previously required
var DatePicker = require('react-date-picker')

(See the updated README at https://www.npmjs.com/package/react-date-picker)

Please do let me know how it goes!

Thanks for the feedback.
The problem was with the momentjs dependency pointing to ~2.8.3. I just created a test app, including momentjs 2.9.0. The bundling process included both the momentjs specified by react-date-picker and the one specified by the app. Updating the dependency in react-date-picker to point to ^2.8.0 (and using npm dedupe) fixed the issue.

So please update to v1.4.2 published to npm.

Also you can refer to https://github.com/radubrehar/react-date-picker-test for a demo on using the date picker with a different locale.
In any case, make sure the resulting bundle (I'm using webpack, but should work pretty much the same with browserify) includes momentjs just once. If you'll have it included twice, the problem will persist