How to get a date that now date minus condition value?

Question

I have a date picker, i want to user cannot pick a date but date now minus this date less than 18 year(i don't want the user less than 18 years old).but i don't know how to do that.

i described my idea by this code below.

    const nowDate = new Date()
    const valueCondition = 18
    const dateWishes = nowDate - valueCondition

how can i do that?

have a nice day, everyone!

Answer 1

Use getFullYear()

const nowDate = new Date();
const valueCondition = 18;
const dateWishes = nowDate.getFullYear() - valueCondition; // 2021 - 18
console.log(dateWishes); // 2003