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    <p>Bottom line, you should <strong>store everything UTC</strong></p> <p>When you display times for a particular user, use a timezone of their choosing. Store the timezone of the user, like "Asia/Calcutta" and simply convert the time when displaying it using the <code>date_default_timezone_set</code> method.</p> <p>I will attempt to answer your questions from the comment here.</p> <p>You store everything UTC always. It is the baseline. When you display the times associated with anything you convert based on the user. If you want to display <strong>Posted 8 mins ago</strong> then you are taking the delta between the current UTC time and the UTC time associated with a post. If you send a message from user A (in India) to user B (in Los Angeles, USA) then you would store the message time in UTC. If user A is viewing it, the time would be converted to "Asia/Calcutta" and if user B is viewing it, the time would be converted to "America/Los_Angeles". Using UTC will make your life a lot easier. Trust me.</p>
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    1. COOk that was I was asking say if I saved time for everything using utc, now you are saying that I should give an option to users to select their time zone and accordingly +/- after retrieving the data from sql right? and will this task also accomplish if I want to show users posted 8 mins ago 9 ins a go and aftr few hours I'll be showing real time? moreover what if a user sends message to another user with different timezone? will php balance the timezone set for both users?
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    2. COIf two users message each other, the fact that they're in different timezones doesn't matter. Any stored dates are stored in UTC, so it's a matter of simply setting date_default_timezone_set for each user to their own timezone, and using DateTime objects. Eg: `$date = new DateTime($theDateInUTC); $date->format('d/m/y h:i:s');`. Then whoever is looking at that date will see it relative to themselves.
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    3. COthanks bro, ins hort, I use `gmdate()` and add or subtract offset using conditions according to the timezone user has set for him..and btw am using procedural...and I am all clear now, I'll be storing dates and time using `gmdate` in my database, and later set default time zone as per his/her setting or show default timezone to him :) and btw any idea to suggest him/her to set timezone, kinda using his ip to know from where he is login in..?or I should let him select tihe timezone himself?
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