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Bug 7114 comment #4, by Tim Starling:
> I have a better idea: a parser function called #time. It takes one required 
> parameter and one optional parameter. The required parameter is a date format in 
> the style of Language::sprintfDate(), which is the internationalised date 
> formatter I wrote a few weeks ago. The optional parameter is a string date as 
> accepted by strtotime(), the same function we use for block expiries. strtotime() 
> accepts both relative and absolute dates, so it could do timezone conversions. 
> 
> For example, you could find out what time it is here in Melbourne with:
> 
> {{#time:H:i|+10 hours}}
> 
> This is very simple to code, just a few lines.

Bug 7114 comment #6, by me:
> If you do this, how about adding U to the list of supported formatting
> characters?  That would mean date arithmetic would be possible via {{#time:
> Y-m-d H:i:s|@{{#expr: {{#time:U|2007-09-25 15:51:01}} - {{#time:U|2006-08-24
> 14:50:00}} }} }}, which is hardly elegant and not particularly efficient but
> should be usable.  (Why not support all PHP's formatting characters anyway? 
> It's not as though cases after the one you hit are going to affect performance,
> I assume.)

Split into a new bug, and I'll dupe all the "{{CURRENTx}}" requests pending to this.