Hello emma,
To set price format like this "$12,345.67" you need to set the format for a specific column this way:
format: webix.Number.numToStr({
decimalSize: 2,
groupDelimiter: ",",
groupSize: 3,
decimalDelimiter: ".",
decimalSize: 2,
prefix:"$"
})
To learn more about number formatting please read this article.
Please check the example: https://snippet.webix.com/jzwylq4p
As for date formatting and localizing dates in the grid youn need to create a locale file, activate the locale.
Here is the article about localization in the grid. And in this article you can find all the date formatting methods.
Please check the example with date localization: https://snippet.webix.com/70v5hw7p