Tips on changing the date to the local equivalent in JavaScript

Question

Tips on changing the date to the local equivalent in JavaScript

I encountered an issue with my AngularJS application where the date value received from a backend service call is in String format, such as "2017-04-13". However, when I attempt to display this date on the UI, JavaScript automatically converts it to local time like "2017-04-12 17:00:00 CST", causing a discrepancy of one day. My goal is to display the date as "2017-04-13 12:00:00 EST" or "2017-04-13 12:00:00 PST" or "2017-04-13 12:00:00 CST" depending on the client's timezone, without altering the date itself or showing a day off on the UI. Is there a way to achieve this using JavaScript? Do I need to use Moment.js and moment-timezone.js for this task?

javascript angularjs date momentjs

Answer 1

Answer №1

There is no need for Moment.js in this case. I encountered a similar issue and opted to utilize the $filter function to modify the date format, enabling the JavaScript date parser to interpret it differently:

var modifiedDate = new Date($filter('date')(newEndDate, 'MMMM d, yyyy'));

Instead of interpreting it as:

new Date('2017-04-13') // Wed Apr 12 2017 19:00:00 GMT-0500 (Central Daylight Time)

You can now interpret it as:

new Date('April 13, 2017');  //Thu Apr 13 2017 00:00:00 GMT-0500 (Central Daylight Time)

Answer 2

There is no need for Moment.js in this case. I encountered a similar issue and opted to utilize the $filter function to modify the date format, enabling the JavaScript date parser to interpret it differently:

var modifiedDate = new Date($filter('date')(newEndDate, 'MMMM d, yyyy'));

Instead of interpreting it as:

new Date('2017-04-13') // Wed Apr 12 2017 19:00:00 GMT-0500 (Central Daylight Time)

You can now interpret it as:

new Date('April 13, 2017');  //Thu Apr 13 2017 00:00:00 GMT-0500 (Central Daylight Time)

Answer 3

Answer №2

If you want to adjust for the timezone offset and work with date formatting, there are a few approaches you can take.

let currentDate = new Date('2017-04-13');
currentDate = new Date(currentDate.getTime() + (currentDate.getTimeZoneOffset() * 60 * 1000));

Another option is to use a custom function that handles date formatting based on UTC values:

Date.prototype.customFormat = function(format) {
    var result = "";

    // Code for custom date formatting here

    return format;
};

let currentDate = new Date('2017-04-13');
currentDate.customFormat('yyyy-mm-dd HH:mm:ss t');
// Result -> 2017-04-13 00:00:00 EDT

Answer 4

If you want to adjust for the timezone offset and work with date formatting, there are a few approaches you can take.

let currentDate = new Date('2017-04-13');
currentDate = new Date(currentDate.getTime() + (currentDate.getTimeZoneOffset() * 60 * 1000));

Another option is to use a custom function that handles date formatting based on UTC values:

Date.prototype.customFormat = function(format) {
    var result = "";

    // Code for custom date formatting here

    return format;
};

let currentDate = new Date('2017-04-13');
currentDate.customFormat('yyyy-mm-dd HH:mm:ss t');
// Result -> 2017-04-13 00:00:00 EDT

Answer 5

Answer №3

Looking into why the date seems to be incorrect, check out this thread on Why does the Date parse method give inaccurate results. This discussion also highlights the pitfalls of using the Date constructor or Date.parse for parsing strings.

If you need a reliable way to parse an ISO 8601 format date as local time, here's a straightforward function that also validates the input values and returns an invalid date if the month or day are outside the expected range. You can easily adjust this function to set the time to noon by assigning 12 to the hours.

function customParseISO(s) {
  var arr = s.split(/\D/);
  var newDate = new Date(arr[0], --arr[1], arr[2]);
  return newDate && newDate.getMonth() == arr[1] ? newDate : new Date(NaN);
}

var parsedDate = customParseISO('2022-10-01');
parsedDate.setHours(12);
console.log(parsedDate.toString());

Answer 6

Looking into why the date seems to be incorrect, check out this thread on Why does the Date parse method give inaccurate results. This discussion also highlights the pitfalls of using the Date constructor or Date.parse for parsing strings.

If you need a reliable way to parse an ISO 8601 format date as local time, here's a straightforward function that also validates the input values and returns an invalid date if the month or day are outside the expected range. You can easily adjust this function to set the time to noon by assigning 12 to the hours.

function customParseISO(s) {
  var arr = s.split(/\D/);
  var newDate = new Date(arr[0], --arr[1], arr[2]);
  return newDate && newDate.getMonth() == arr[1] ? newDate : new Date(NaN);
}

var parsedDate = customParseISO('2022-10-01');
parsedDate.setHours(12);
console.log(parsedDate.toString());

Tips on changing the date to the local equivalent in JavaScript

Answer №1

Answer №2

Answer №3

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