bookmarklet to sort table in e journal system

index.js

javascript:(function sortTable(){
  let tables = document.getElementsByTagName("table");
  for (let table of tables) {
    let stores = [];
    const rows = table.tBodies[0].children;
    for(let row of rows){
      const rowValue = row.children[0].innerText;
      const matches = rowValue.match(
        /^ +(\S+) +(\S+) +(\S+|\d\S\s{2}\S+) +(\d{1,2}\/\d{1,2}) .+(\d{2}-\d{2}) +(\d{2}:\d{2})$/,
      );
      if (matches) {
        const attendance = matches[4].split("/");
        if (attendance[0] !== attendance[1]) row.style.cssText += 'background-color: #f2dede;';
        const date = matches[5];
        const time = matches[6];
        const year = new Date().getFullYear();
        const datetime = new Date(`${year}-${date} ${time}`);
        stores.push([datetime, row]);
      }
    }
    stores.sort(function(x,y){
        return x[0] - y[0];
    });
    for(var i=0, len=stores.length; i<len; i++){
        table.appendChild(stores[i][1]);
    }
    stores = null;
  }
})()