What is the best way to transform a UTC/GMT date and time into CST in Javascript? (CST specifically, not based on

Question

What is the best way to transform a UTC/GMT date and time into CST in Javascript? (CST specifically, not based on

Dealing with a tricky situation where backend data is always stored in UTC time while our front-end data is in CST. Unfortunately, I don't have access to the system handling this 'black box' conversion.

Trying to replicate this setup in our data warehouse based in Europe (CET), so traditional "local" conversion won't suffice.

Seeking advice on the most direct and foolproof method to accurately convert UTC time (available in either epoch milliseconds or '2015-01-01 00:00:00' date format) to Central Standard Time (which could be either 5 or 6 hours behind depending on Daylight Savings).

Avoiding the common solutions of converting to 'local' time or simply subtracting 6 hours, as they are not reliable throughout the year.

If anyone has innovative suggestions for addressing this widely encountered issue, please share as my research has yielded no satisfactory answers thus far.

javascript datetime timezone data-conversion timezone-offset

Answer 1

Answer №1

When utilizing moment.js along with the moment-timezone extension, completing this task becomes straightforward.

// create a moment object based on UTC input
var m = moment.utc('2015-01-01 00:00:00');

// convert to US Central time using TZDB identifier
m.tz('America/Chicago');

// customize output format as needed
var s = m.format("YYYY-MM-DD HH:mm:ss");

Furthermore, when referring to the entire North American Central time zone, it is advisable to use either "Central Time" or "CT". The abbreviation "CST" specifically denotes UTC-6 in North America, while "CDT" is used for UTC-5 during daylight saving time.

Exercise caution with abbreviations as well. "CST" may also refer to "China Standard Time" and has five different interpretations.

Answer 2

When utilizing moment.js along with the moment-timezone extension, completing this task becomes straightforward.

// create a moment object based on UTC input
var m = moment.utc('2015-01-01 00:00:00');

// convert to US Central time using TZDB identifier
m.tz('America/Chicago');

// customize output format as needed
var s = m.format("YYYY-MM-DD HH:mm:ss");

Furthermore, when referring to the entire North American Central time zone, it is advisable to use either "Central Time" or "CT". The abbreviation "CST" specifically denotes UTC-6 in North America, while "CDT" is used for UTC-5 during daylight saving time.

Exercise caution with abbreviations as well. "CST" may also refer to "China Standard Time" and has five different interpretations.

Answer 3

Answer №2

To determine whether to subtract 5 or 6 hours, you can use the time zone offset.

var dateJan;
var dateJul;
var timezoneOffset;

var divUTC;
var divCST;

// Set initial date value
dateValue = new Date('10/31/2015 7:29:54 PM');

divUTC = document.getElementById('UTC_Time');
divCST = document.getElementById('CST_Time');
divUTC.innerHTML = 'from UTC = ' + dateValue.toString();

// Get dates for January and July
dateJan = new Date(dateValue.getFullYear(), 0, 1);
dateJul = new Date(dateValue.getFullYear(), 6, 1);

// Get timezone offset
timezoneOffset = Math.max(dateJan.getTimezoneOffset(), dateJul.getTimezoneOffset());

// Check if daylight savings
if (dateValue.getTimezoneOffset() < timezoneOffset) {
  // Adjust date by 5 hours
  dateValue = new Date(dateValue.getTime() - ((1 * 60 * 60 * 1000) * 5));
}
else {
  // Adjust date by 6 hours
  dateValue = new Date(dateValue.getTime() - ((1 * 60 * 60 * 1000) * 6));
}

divCST.innerHTML = 'to CST = ' + dateValue.toString();

<div id="UTC_Time"></div>
<br/>
<div id="CST_Time"></div>

Answer 4

To determine whether to subtract 5 or 6 hours, you can use the time zone offset.

var dateJan;
var dateJul;
var timezoneOffset;

var divUTC;
var divCST;

// Set initial date value
dateValue = new Date('10/31/2015 7:29:54 PM');

divUTC = document.getElementById('UTC_Time');
divCST = document.getElementById('CST_Time');
divUTC.innerHTML = 'from UTC = ' + dateValue.toString();

// Get dates for January and July
dateJan = new Date(dateValue.getFullYear(), 0, 1);
dateJul = new Date(dateValue.getFullYear(), 6, 1);

// Get timezone offset
timezoneOffset = Math.max(dateJan.getTimezoneOffset(), dateJul.getTimezoneOffset());

// Check if daylight savings
if (dateValue.getTimezoneOffset() < timezoneOffset) {
  // Adjust date by 5 hours
  dateValue = new Date(dateValue.getTime() - ((1 * 60 * 60 * 1000) * 5));
}
else {
  // Adjust date by 6 hours
  dateValue = new Date(dateValue.getTime() - ((1 * 60 * 60 * 1000) * 6));
}

divCST.innerHTML = 'to CST = ' + dateValue.toString();

<div id="UTC_Time"></div>
<br/>
<div id="CST_Time"></div>

Answer 5

Answer №3

Perhaps you could consider implementing a similar approach as shown below. Please keep in mind that this is just a sample and may require customization based on your specific requirements.

    const localTime = new Date(createdAt).toLocaleString("es-MX", {
    timeZone: "America/Mexico_City" });

Answer 6

Perhaps you could consider implementing a similar approach as shown below. Please keep in mind that this is just a sample and may require customization based on your specific requirements.

    const localTime = new Date(createdAt).toLocaleString("es-MX", {
    timeZone: "America/Mexico_City" });

Answer 7

Answer №4

To perform the conversion, you can utilize the following code snippet.

function convertUTCToPST() {
    var timeDifference = 8; // Pacific Time Zone
    var utc = new Date();
    var pst = new Date(utc.getTime()-((1 * 60 * 60 * 1000) * timeDifference));
    console.log("PST: "+pst);
}

Answer 8

To perform the conversion, you can utilize the following code snippet.

function convertUTCToPST() {
    var timeDifference = 8; // Pacific Time Zone
    var utc = new Date();
    var pst = new Date(utc.getTime()-((1 * 60 * 60 * 1000) * timeDifference));
    console.log("PST: "+pst);
}

Answer 9

Answer №5

const currentDate = moment(new Date()).utc().format("YYYY-MM-DD HH:mm:ss").toString()
let momentObj = moment.utc(currentDate);
momentObj.tz('America/Chicago');
const cstTime = momentObj.format("YYYY-MM-DD HH:mm:ss");

Answer 10

const currentDate = moment(new Date()).utc().format("YYYY-MM-DD HH:mm:ss").toString()
let momentObj = moment.utc(currentDate);
momentObj.tz('America/Chicago');
const cstTime = momentObj.format("YYYY-MM-DD HH:mm:ss");

Answer 11

Answer №6

Feel free to utilize the code snippet provided below:

// Obtain timezone offset for Central Daylight Time or Central Standard Time
const getCdtCstOffset = () => {
  const getNthSunday = (date, nth) => {
      date.setDate((7*(nth-1))+(8-date.getDay()));
      return date;
  }
  const isCdtTimezoneOffset = (today) => {
    console.log('Today : ', today);
    let dt = new Date();
    var mar = new Date(dt.getFullYear(), 2, 1);
    mar = getNthSunday(mar, 2);
    console.log('CDT Start : ', mar);
    var nov = new Date(dt.getFullYear(), 10, 1, 23, 59, 59);
    nov = getNthSunday(nov, 1);
    console.log('CDT End : ', nov);
    return mar.getTime()< today.getTime() && nov.getTime()> today.getTime();
  }
  var today = new Date(); // current date
  if (isCdtTimezoneOffset(today)) {
    return -5;
  } else {
    return -6;
  }
}
let cstOrCdt = new Date();
cstOrCdt.setHours(cstOrCdt.getHours()+getCdtCstOffset());
console.log('CstOrCdt : ', cstOrCdt);

Answer 12

Feel free to utilize the code snippet provided below:

// Obtain timezone offset for Central Daylight Time or Central Standard Time
const getCdtCstOffset = () => {
  const getNthSunday = (date, nth) => {
      date.setDate((7*(nth-1))+(8-date.getDay()));
      return date;
  }
  const isCdtTimezoneOffset = (today) => {
    console.log('Today : ', today);
    let dt = new Date();
    var mar = new Date(dt.getFullYear(), 2, 1);
    mar = getNthSunday(mar, 2);
    console.log('CDT Start : ', mar);
    var nov = new Date(dt.getFullYear(), 10, 1, 23, 59, 59);
    nov = getNthSunday(nov, 1);
    console.log('CDT End : ', nov);
    return mar.getTime()< today.getTime() && nov.getTime()> today.getTime();
  }
  var today = new Date(); // current date
  if (isCdtTimezoneOffset(today)) {
    return -5;
  } else {
    return -6;
  }
}
let cstOrCdt = new Date();
cstOrCdt.setHours(cstOrCdt.getHours()+getCdtCstOffset());
console.log('CstOrCdt : ', cstOrCdt);

What is the best way to transform a UTC/GMT date and time into CST in Javascript? (CST specifically, not based on

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

Answer №6

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