I think you'll find we get there way before you do in the UK here in Oz. Entries were still rolling in way after my clock had got to zero. Not that it matters, the more entries the better I reckon. A quick check right now as I type this shows it's still Thursday evening in the UK, but its 6am, Friday, here. If I have entries I just put them in sooner (a week or two before deadline), rather then bamboozle myself with time zones.
You are currently 9 hrs ahead of the UK so a Sunday 12.00 midday deadline means Sunday 9pm where you are.