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								import { FORMAT_DEFAULT } from '../../constant';
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								export default (function (o, c) {
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								  // locale needed later
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								  var proto = c.prototype;
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								  var oldFormat = proto.format; // extend en locale here
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								  proto.format = function (formatStr) {
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								    var _this = this;
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								    var yearBias = 543;
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								    var str = formatStr || FORMAT_DEFAULT;
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								    var result = str.replace(/(\[[^\]]+])|BBBB|BB/g, function (match, a) {
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								      var _this$$utils;
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								      var year = String(_this.$y + yearBias);
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								      var args = match === 'BB' ? [year.slice(-2), 2] : [year, 4];
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								      return a || (_this$$utils = _this.$utils()).s.apply(_this$$utils, args.concat(['0']));
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								    });
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								    return oldFormat.bind(this)(result);
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								  };
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								});
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