Date Time - Javascript

let var = new Date() => Returns current date and time and day in IST
new Date(0) => Returns date and time of Jan 1st 1970 5:30:00
new Date(n) => Returns date and time by adding n millisecond to Jan 1st 1970 5:30:00
new Date("2021-01-01") => Returns date and day of that day
new Date(year, month, date, hours, minutes, seconds) => Returns date of given information
var.getFullYear()
var.getDay()
var.getMonth()
var.getDate()
var.getMinutes()
var.getSeconds()
var.getHours()
var.setDate(n)
var.setHours(n)
var.setMinutes(n)
var.toLocaleTimeString()
Date.now() => Returns Number of milliseconds passed since Jan 1 1970, 5:30:01