Kamu bisa membuat sebuah tanggal menggunakan sintax berikut:<pre class="ql-syntax" spellcheck="false">new Date()
</pre> 1. Menambahkan custom tanggal<pre class="ql-syntax" spellcheck="false">const date = new Date("2020-12-31");
</pre>result: <pre class="ql-syntax" spellcheck="false">Thu Dec 31 2020 01:00:00 GMT+0100 (Central European Standard Time)
</pre> 2. Formatting Date<pre class="ql-syntax" spellcheck="false">let newDate = new Date("2021-01-09T14:56:23")

newDate.toString()
// "Sat Jan 09 2021 14:56:23 GMT+0100 (Central European Standard Time)"

newDate.toDateString()
// "Sat Jan 09 2021"

newDate.toLocaleDateString()
// "1/9/2021"

newDate.toLocaleTimeString()
// "2:56:23 PM"

newDate.toLocaleString()
// "1/9/2021, 2:56:23 PM"

newDate.toGMTString()
// "Sat, 09 Jan 2021 13:56:23 GMT"

newDate.toUTCString()
// "Sat, 09 Jan 2021 13:56:23 GMT"

newDate.toISOString()
// "2021-01-09T13:56:23.000Z"

newDate.toTimeString()
// "14:56:23 GMT+0100 (Central European Standard Time)"

newDate.getTime()
// 1610200583000

newDate.getFullYear() // 2021
newDate.getMonth() // 0 (zero-based index)
newDate.getDate() // 9
newDate.getDay() // 6 (zero-based index starting from Sunday)
newDate.getHours() // 14
newDate.getMinutes() // 56
newDate.getUTCHours() // 9
newDate.getUTCDate() // 9
</pre> 3. Merubah Localization<pre class="ql-syntax" spellcheck="false">let newDate = new Date("2021-01-09T14:56:23")

//format according to the computer's default locale
Intl.DateTimeFormat().format(newDate)
// "1/9/2021"

//format according to a specific locale, e.g. de-DE (Germany)
Intl.DateTimeFormat("de-DE").format(newDate)
// "9.1.2021"

let options = {
 year: "numeric",
 month: "long",
 weekday: "long",
 hour: "numeric",
 minute: "numeric",
}

Intl.DateTimeFormat("en-US", options).format(newDate)
// "January 2021 Saturday, 2:56 PM"
</pre> 4. Komparasi Date<pre class="ql-syntax" spellcheck="false">let first = new Date(2010, 3, 19)
let second = new Date(2010, 3, 24)

first &gt; second //false

first = new Date(2009, 12, 23)
second = new Date(2009, 12, 23)

console.log(first == second) // false
console.log(first === second) // false
first.getTime() === second.getTime() // true
</pre> Sumber https://livecodestream.dev/post/date-manipulation-in-javascript-a-complete-guide/

Manipulasi Date menggunakan pure javascript

Manipulasi Date Yang Wajib Kamu Ketahui Pada Javascript