why inside NetSuite client script does the following code return this 2023-05-30 but inside node/browser 05-30-2023

const today_date = new Date().toLocaleDateString("en-US");

I faced same issue some time ago. Can you play with user preferences for dates format and see if this affect the code on client-script

If it's a client script you should get the same results as the browser

well chat gpt gave a good idea

var todayDate = new Date();
var formattedDate = format.format({
    value: todayDate,
    type: format.Type.DATE,
    format: "MM/dd/yyyy"
});