JSFiddle - React, Tailwind, and code Playground

JavaScript

var expenseDates = ["2018-02-06","2018-11-08","2018-11-10","2017-05-02","2017-05-02","2018-11-01"];

    expenseDates = expenseDates.sort(function(a, b) {
    	return a.localeCompare(b);
    });
    
   console.log('--min => ',expenseDates[0]);
   console.log('--max => ', expenseDates[expenseDates.length -1]);