let now = new Date();

let options = {
    year: "2-digit",
    month: "2-digit",
    day: "2-digit",
    hour: "numeric",
    minute: "2-digit"
};
let shortStyleEn = now
    .toLocaleDateString("en-US", options);
//shortStyleEn is "05/24/18 5:36 PM"

options.hour = "2-digit";
let shortStyleRu = now
    .toLocaleDateString("ru-Ru", options);
//shortStyleRu is "25.05.18 08:54"

let customStyle = now.toJSON().slice(0, 10);
//customStyle is 2018-05-24

console.log(`shortStyleEn is \"${shortStyleEn}\"`);
console.log(`shortStyleRu is \"${shortStyleRu}\"`);
console.log(`customStyle is \"${customStyle}\"`);