{"ast":null,"code":"import { toDate } from \"./toDate.mjs\";\n\n/**\n * @name startOfDecade\n * @category Decade Helpers\n * @summary Return the start of a decade for the given date.\n *\n * @description\n * Return the start of a decade for the given date.\n *\n * @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).\n *\n * @param date - The original date\n *\n * @returns The start of a decade\n *\n * @example\n * // The start of a decade for 21 October 2015 00:00:00:\n * const result = startOfDecade(new Date(2015, 9, 21, 00, 00, 00))\n * //=> Jan 01 2010 00:00:00\n */\nexport function startOfDecade(date) {\n  // TODO: Switch to more technical definition in of decades that start with 1\n  // end with 0. I.e. 2001-2010 instead of current 2000-2009. It's a breaking\n  // change, so it can only be done in 4.0.\n  const _date = toDate(date);\n  const year = _date.getFullYear();\n  const decade = Math.floor(year / 10) * 10;\n  _date.setFullYear(decade, 0, 1);\n  _date.setHours(0, 0, 0, 0);\n  return _date;\n}\n\n// Fallback for modularized imports:\nexport default startOfDecade;","map":null,"metadata":{},"sourceType":"module","externalDependencies":[]}