How to display the time on the site regardless of the time zone of the client and its system time?

Question

PHP

Good afternoon. How to display the time on the site regardless of the time zone of the client and its system time? rummaged through a bunch of information in a clear language, no one wrote. It seems that all the authors write somewhere in the wrong place (((
Who can know an adequate solution, I want to display the organization's working time on the site in local time! SOS!

Answer 1

Display the time in UTC and add the desired time zone. For example, for Moscow +3 hours:

$offset = 3; /* смещение часово пояса */
$date = gmdate('d-m-Y - H:i:s', (time() + ($offset * 3600))); /* прибавляем к time() три часа */
echo $date;

Or it's even easier to set the default time zone in the script, because due to winter/summer time translations, there may be an incorrect offset:

date_default_timezone_set('Europe/Moscow'); /* устанавливаем временную зону */
$date = date('d-m-Y - H:i:s');
echo $date;

list of time zones

Answer 2

Might be useful to someone

$(function () {
     setTimeout(function() {
            $.ajax({
                url: '/clock.php',
                type: 'POST',
            }).done(function(dataSite) {
                $('#time').html(dataSite);
            })
        }, 0);
     setInterval(function() {
            $.ajax({
                url: '/clock.php',
                type: 'POST',
            }).done(function(dataSite) {
                $('#time').html(dataSite);
            })
        }, 60000);
    var h = parseInt ($('#time').text(), 10);
        var imeWork = (h >= 9 && h <= 18) ? '<span class="green";>Мы работаем</span>' : '<span class="red";>Мы закрыты</span>';
        $('#work').html(imeWork);
    });

clock.php

<?php
date_default_timezone_set('Asia/Vladivostok'); /* устанавливаем временную зону */
$dateSite = date('H:i');
echo $dateSite;