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this is not complete solution but partially accepted
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the web app runs joomla on apache server running Mysql as dB.<br />
the server timezone is set to UTC and time values are too saved in UTC in dB.<br />
<br />
a registered user in the site can store his events details in calendar in his account.<br />
this details will be available to others on the site for them to interact.<br />
<br />
&nbsp;the problem is that the user recieves the details in UTC for himself and others too. even if the user gives the time zone details at the time of registration, it will become static. for eg if the user changes time zone during travel, the content will be available for the old time zone only.<br />
<br />
if i use JS to change the content on load, there are issues related tooltip and calendar positioning as the calendar is processed by PHP not JS. so i need the user time zone value in server for PHP to process the object variable.<br />
<br />
If there is a way using server request or some other means to sort this problem out, it will be really helpful.<br />
<br />
thanks in advance, i guess i have not missed out anything in explaining about issue.
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the web app runs joomla on apache server running Mysql as dB.
the server timezone is set to UTC and time values are too saved in UTC in dB.

a registered user in the site can store his events details in calendar in his account.
this details will be available to others on the site for them to interact.

 the problem is that the user recieves the details in UTC for himself and others too. even if the user gives the time zone details at the time of registration, it will become static. for eg if the user changes time zone during travel, the content will be available for the old time zone only.

if i use JS to change the content on load, there are issues related tooltip and calendar positioning as the calendar is processed by PHP not JS. so i need the user time zone value in server for PHP to process the object variable.

If there is a way using server request or some other means to sort this problem out, it will be really helpful.

thanks in advance, i guess i have not missed out anything in explaining about issue.

this is not complete solution but partially accepted

How to get client time zone to server from browser for showing based on that.

Web applications are systems that run in browsers that perform functions normally associated with other client-based programs. One of the most commonly used web applications is email; instead of downloading individual emails to a local machine, the data is shown through a website. Other examples of web applications are collaborative systems like a wiki or an online game.

Web Applications

Joomla is a free and open-source content management system (CMS) for publishing web content. It is built on a model–view–controller web application framework that can be used independently of the CMS. Written in PHP, Joomla uses object-oriented programming (OOP) techniques and software design patterns, stores data in a MySQL, MS SQL  or PostgreSQL database, and includes features such as page caching, RSS feeds, printable versions of pages, news flashes, blogs, search, and support for language internationalization.

Joomla

The Hypertext Transfer Protocol (HTTP) is an application protocol for distributed, collaborative, hypermedia information systems. Hypertext is structured text that uses logical links (hyperlinks) between nodes containing text. HTTP is the protocol to exchange or transfer hypertext. HTTP functions as a request-response protocol in the client-server computing model. HTTP is designed to permit intermediate network elements to improve or enable communications between clients and servers. HTTP is an application layer protocol designed within the framework of the Internet Protocol Suite; it presumes an underlying and reliable transport layer protocol.

HTTP Protocol

Web development includes all aspects of presenting content on intranets and the Internet, including delivery development, protocols, languages and standards, server software, browser clients, databases and multimedia generation.