Get Date and Time for a Given Timezone in Node.js

// Date object initialized as per New Zealand timezone. Returns a datetime string
let nz_date_string = new Date().toLocaleString("en-US", { timeZone: "Asia/Calcutta" });

// Date object initialized from the above datetime string
let date_nz = new Date(nz_date_string);

// year as (YYYY) format
let year = date_nz.getFullYear();

// month as (MM) format
let month = ("0" + (date_nz.getMonth() + 1)).slice(-2);

// date as (DD) format
let date = ("0" + date_nz.getDate()).slice(-2);

// hours as (HH) format
let hours = ("0" + date_nz.getHours()).slice(-2);

// minutes as (mm) format
let minutes = ("0" + date_nz.getMinutes()).slice(-2);

// seconds as (ss) format
let seconds = ("0" + date_nz.getSeconds()).slice(-2);

// date as YYYY-MM-DD format
let date_yyyy_mm_dd = year + "-" + month + "-" + date;
console.log("Date in YYYY-MM-DD format: " + date_yyyy_mm_dd);

// time as hh:mm:ss format
let time_hh_mm_ss = hours + ":" + minutes + ":" + seconds;
console.log("Time in hh:mm:ss format: " + time_hh_mm_ss);

// date and time as YYYY-MM-DD hh:mm:ss format
let date_time = year + "-" + month + "-" + date + " " + hours + ":" + minutes + ":" + seconds;
console.log("Date and Time in YYYY-MM-DD hh:mm:ss format: " + date_time);

let date_ob = new Date();

getDate : returns the day of the month (1-31)
getMonth : returns the month as an integer (0-11). Note that January is represented as 0 and December as 11.
getFullYear : returns the year in 4-digit format
getHours: returns the hour of the day in 24-hour format (0-23)
getMinutes: returns the minute (0-59)
getSeconds: returns the seconds (0-59)

let date_ob = new Date();

// current date
// adjust 0 before single digit date
let date = ("0" + date_ob.getDate()).slice(-2);

// current month
let month = ("0" + (date_ob.getMonth() + 1)).slice(-2);

// current year
let year = date_ob.getFullYear();

// current hours
let hours = date_ob.getHours();

// current minutes
let minutes = date_ob.getMinutes();

// current seconds
let seconds = date_ob.getSeconds();

// prints date in YYYY-MM-DD format
console.log(year + "-" + month + "-" + date);

// prints date & time in YYYY-MM-DD HH:MM:SS format
console.log(year + "-" + month + "-" + date + " " + hours + ":" + minutes + ":" + seconds);

// prints time in HH:MM format
console.log(hours + ":" + minutes);

let ts = Date.now();

// timestamp in milliseconds
console.log(ts);

// timestamp in seconds
console.log(Math.floor(ts/1000));