index.js 1.1 KB

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  1. "use strict";
  2. var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault").default;
  3. Object.defineProperty(exports, "__esModule", {
  4. value: true
  5. });
  6. exports.default = startOfDecade;
  7. var _index = _interopRequireDefault(require("../toDate/index.js"));
  8. var _index2 = _interopRequireDefault(require("../_lib/requiredArgs/index.js"));
  9. /**
  10. * @name startOfDecade
  11. * @category Decade Helpers
  12. * @summary Return the start of a decade for the given date.
  13. *
  14. * @description
  15. * Return the start of a decade for the given date.
  16. *
  17. * @param {Date|Number} date - the original date
  18. * @returns {Date} the start of a decade
  19. * @throws {TypeError} 1 argument required
  20. *
  21. * @example
  22. * // The start of a decade for 21 October 2015 00:00:00:
  23. * const result = startOfDecade(new Date(2015, 9, 21, 00, 00, 00))
  24. * //=> Jan 01 2010 00:00:00
  25. */
  26. function startOfDecade(dirtyDate) {
  27. (0, _index2.default)(1, arguments);
  28. var date = (0, _index.default)(dirtyDate);
  29. var year = date.getFullYear();
  30. var decade = Math.floor(year / 10) * 10;
  31. date.setFullYear(decade, 0, 1);
  32. date.setHours(0, 0, 0, 0);
  33. return date;
  34. }
  35. module.exports = exports.default;