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Here’s how I did this.

First, I created the “Time Zone” select box for xProfile by putting the code in the following link into my functions.php file.

http://docs.taptappress.com/buddypress-add-time-zone-list-profile-field/

Once functions.php is run once, it will add the Time Zone field to the user profile. Once its been added, you can delete everything except the $zones array (you’ll need it later).

I then created a new function to look up the users time zone and display the last thread date based on that time zone. Put this in your functions.php file.

function mycustom_get_message_thread_last_post_date() {
	global $messages_template;
	$timezone = mycustom_get_member_timezone();
	if ($timezone != '' ) {	
		$timestamp = '@' . strtotime($messages_template->thread->last_message_date); 
		$dt = new DateTime( $timestamp );
		$dt->setTimeZone(new DateTimeZone($timezone));
		return $dt->format('M j, Y, g:i a'); /* format the displayed timestamp however you want */
	} else {
		return bp_format_time( strtotime( $messages_template->thread->last_message_date ) );
	}
}

function mycustom_get_member_timezone() {
/** put the $zones array from the first step here.  I've left it out to save space in this post **/
   return array_search(bp_get_member_profile_data('field=Time Zone'), $zones);	
}

In a child theme, add/edit /members/single/messages/message-loop.php to use your new custom function. There’s two places you need to do this (inbox and sent).

Replace

<span class="activity"><?php bp_message_thread_last_post_date(); ?></span>

With

<span class="activity"><?php echo mycustom_get_message_thread_last_post_date(); ?></span>

That’s it.

Note: Technically you can do without the array if you want, but I wanted to display the GMT offset to the user instead of ‘US/Alaska’ (for example)

@shanebp Sorry for the late reply on this. I didnt have a notification set. Anyhow, thanks for writing this!

I installed the BP-Timezone plugin and activated it, but the loader is not adding the timezones to the db. The field gets added correctly. I’m running BP 2.0.2. Any ideas?

As far as hook suggestions, since starting this topic I haven’t come across another place to hook into. Once I get this plugin to install correctly, I’ll hunt for other places to use it.

Thanks again.