JSFiddle - React, Tailwind, and code Playground

by Travis Harris

JavaScript

var str = "12:00:00,11:30:00,10:30:00,10:00:00,09:30:00";
var new_str = str.split(",").map(function(x){return x.replace(/^(.*):.*$/, "$1")}).join(",");
console.log(new_str);