dateFormat must define all six date components or NaN is returned

[watery]

A date format expressed like:

data: {
    dateFormat : "yyyy-MM-dd HH:mm"

Doesn't assign a value to fmt[secs] in Gantt.utils.createDateParser(format), which results in undefined when passed in:

gantt-chart/packages/ibm-gantt-chart/src/core/utils.js

Lines 107 to 115 in d4e55dd

	return new Date(
	parts[fmt[year]],
	parts[fmt[month]] - 1,
	parts[fmt[day]],
	parts[fmt[hour]],
	parts[fmt[min]],
	parts[fmt[secs]]
	).getTime();
	};

resulting in a NaN value, but without any error thrown.