gitlab-org--gitlab-foss/app/assets/javascripts/contributors/utils.js

import { getMonthNames } from '~/lib/utils/datetime_utility';

/**
 * Converts provided string to date and returns formatted value as a year for date in January and month name for the rest
 * @param {String}
 * @returns {String}  - formatted value
 *
 * xAxisLabelFormatter('01-12-2019') will return '2019'
 * xAxisLabelFormatter('02-12-2019') will return 'Feb'
 * xAxisLabelFormatter('07-12-2019') will return 'Jul'
 */
export const xAxisLabelFormatter = (val) => {
  const date = new Date(val);
  const month = date.getUTCMonth();
  const year = date.getUTCFullYear();
  return month === 0 ? `${year}` : getMonthNames(true)[month];
};

/**
 * Formats provided date to YYYY-MM-DD format
 * @param {Date}
 * @returns {String}  - formatted value
 */
export const dateFormatter = (date) => {
  const year = date.getUTCFullYear();
  const month = date.getUTCMonth();
  const day = date.getUTCDate();

  return `${year}-${`0${month + 1}`.slice(-2)}-${`0${day}`.slice(-2)}`;
};