This forum is for MetaMod... but never mind, you're talking about MetaTemplate Pro.

For the time selector - in a way that's already there in MetaTemplate Pro. The date/time selectors are very versatile.

e.g. you can use plain times (without date). So you can set the start date/time to 08:00 and the end date/time to 08:50, and for that rule, set the template to switch to a certain template. Just make a new rule for each time period during the day.

If you want to do anything more complex, like 08:00 - 08:50 on Mondays and Tuesdays, you could use the time selectors as above, then add a small piece of PHP to detect the day of week: e.g. if ( MM_DAY_OF_WEEK == 2 or MM_DAY_OF_WEEK == 3 ) return true;

For anything more complex than that, you're better off with doing it in PHP, as there are so many options and permutations possible.

GmAccess

I took a look at the GmAccess thread you mentioned.

It looks like you can access the GmAccess groups, by accessing $user->gmid. That probably works inside MetaTemplate too, depending on how early the GmAccess system plugin gets run (whether it's run by the time MetaTemplate starts).

So, off the top of my head, I think you may be able to access the GmAccess groups from the MetaTemplate PHP box pretty much like you do in that thread:

$access_array = explode( ",", $user->gmid );
if (in_array( 7, $access_array )){
  $template = 'pubicite';
} elseif (in_array( 6, $access_array )){
  $template = 'mode';
} elseif (in_array( 5, $access_array )){
  $template = 'famille';
} elseif (in_array( 1, $access_array )){
  $template = 'membre';
} else{
  $template = 'public';
}
return $template;

I'd be very interested to know if this works. You can try it with the (free) MetaTemplate; you don't need Pro for this.

Still working on documentation - sorry it's not ready. There's a bit of info on http://www.metamodpro.com/software/metatemplate but that's all at the moment.

Cheers,
Stephen