Tooltip xDateFormatter option

[ravindUwU]

Description of the feature

A tooltip.xDateFormatter option that allows formatting timestamps with a non-dateFormat format, in addition to the tooltip.xDateFormat option.

This would be analogous to,

• tooltip.pointFormat and tooltip.pointFormatter.
• tooltip.nullFormat and tooltip.nullFormatter.

Library related to the feature

Highcharts

API example

xDateFormatter could be a (this: Point, timestamp: number) => string, and used as 👇,

import * as Highcharts from 'highcharts';
import { DateTime } from 'luxon';

options: Highcharts.Options = {
	// ...
	tooltip: {
		// Instead of a fixed format 👇
		xDateFormat: '%Y/%m/%d, %l:%M %P',

		// Delegate formatting to a different library (Luxon, in this case) 👇
		xDateFormatter(timestamp) {
			return DateTime.fromMillis(timestamp).toLocaleString(DateTime.DATETIME_SHORT);
		},
	},
};

[pawellysy]

Thanks for creating this feature request!
As a workaround, you can use both methods mentioned above, where you can format the date the same way you described.

[github-actions]

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