import { differenceInCalendarDays } from './differenceInCalendarDays.js';
import { startOfYear } from './startOfYear.js';
import { toDate } from './toDate.js';

/**
 * @name getDayOfYear
 * @category Day Helpers
 * @summary Get the day of the year of the given date.
 *
 * @description
 * Get the day of the year of the given date.
 *
 * @typeParam DateType - The `Date` type, the function operates on. Gets inferred from passed arguments. Allows to use extensions like [`UTCDate`](https://github.com/date-fns/utc).
 *
 * @param date - The given date
 *
 * @returns The day of year
 *
 * @example
 * // Which day of the year is 2 July 2014?
 * const result = getDayOfYear(new Date(2014, 6, 2))
 * //=> 183
 */
function getDayOfYear(date) {
  const _date = toDate(date);
  const diff = differenceInCalendarDays(_date, startOfYear(_date));
  const dayOfYear = diff + 1;
  return dayOfYear;
}

export { getDayOfYear };
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