var parse = require('../parse/index.js') /** * @category Year Helpers * @summary Return the start of a year for the given date. * * @description * Return the start of a year for the given date. * The result will be in the local timezone. * * @param {Date|String|Number} date - the original date * @returns {Date} the start of a year * * @example * // The start of a year for 2 September 2014 11:55:00: * var result = startOfYear(new Date(2014, 8, 2, 11, 55, 00)) * //=> Wed Jan 01 2014 00:00:00 */ function startOfYear (dirtyDate) { var cleanDate = parse(dirtyDate) var date = new Date(0) date.setFullYear(cleanDate.getFullYear(), 0, 1) date.setHours(0, 0, 0, 0) return date } module.exports = startOfYear