39 lines
1,010 B
JavaScript
39 lines
1,010 B
JavaScript
import { createDateTimeFormat } from '../../locale';
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let dateTimeFormats;
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export const initDateFormats = () => {
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const dayFormat = createDateTimeFormat({ month: 'short', day: 'numeric' });
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const monthFormat = createDateTimeFormat({ month: 'long' });
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const yearFormat = createDateTimeFormat({ year: 'numeric' });
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dateTimeFormats = {
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dayFormat,
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monthFormat,
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yearFormat,
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};
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};
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initDateFormats();
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/**
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Formats a localized date in way that it can be used for d3.js axis.tickFormat().
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That is, it displays
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- 4-digit for first of January
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- full month name for first of every month
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- day and abbreviated month otherwise
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see also https://github.com/d3/d3-3.x-api-reference/blob/master/SVG-Axes.md#tickFormat
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*/
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export const dateTickFormat = date => {
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if (date.getDate() !== 1) {
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return dateTimeFormats.dayFormat.format(date);
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}
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if (date.getMonth() > 0) {
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return dateTimeFormats.monthFormat.format(date);
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}
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return dateTimeFormats.yearFormat.format(date);
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};
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