Use Client's Time Zone free WordPress plugin

This plugin retrieves the time zone of the client using “Automatic Timezone Detection Using JavaScript” (http://pellepim.bitbucket.org/jstz/) the first time that a client accesses the site, sets a cookie containing the client’s time zone on the client, and reloads the page. This cookie is then read by PHP and the date_default_timezone_set() function (requires PHP 5 >= 5.1.0) is used to set the default time zone for PHP scripts. Since it runs just after all of the plugins are loaded, it changes the time zone for all of the PHP that follows. It is useful in cases where one wants users to see certain posts on certain days. E.g., if the post slug contains the day number, like “xyz-daynr,” then the post can be specified by “$slug = ‘xyz’.date(j);” in a theme template. The cookie does not expire for ten years, but is reset if the user changes time zones. So, unless the user deletes cookies or moves the page reload only occurs once every ten years. Copyright 2012-2015 M.D. Green, SaeSolved:: LLC License This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.1. A note was posted in our forum stating that sites may experience problems if changing timezones using date_default_timezone_set. WP expects it to always be UTC and display of things in different timezones are achieved in other ways: https://vip.wordpress.com/documentation/vip-development-tips-tricks/use-current_time-not-date_default_timezone_set/ The author has not observed any problems on the sites on which this plugin has been tested. Based on the foregoing post, however,it would be wise to check that no date-related operations are going awry after activating this plugin — even though no problems have been observed with the sites tested. To do: Develop, if possible, a way to effect the use of methods, other than using the date_default_timezone_set() function, to produce the same functionality the plugin currently has.