export default (function (o, c) {
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								  var proto = c.prototype;
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								  proto.weekday = function (input) {
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								    var weekStart = this.$locale().weekStart || 0;
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								    var $W = this.$W;
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								    var weekday = ($W < weekStart ? $W + 7 : $W) - weekStart;
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								    if (this.$utils().u(input)) {
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								      return weekday;
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								    }
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								    return this.subtract(weekday, 'day').add(input, 'day');
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								  };
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								});
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