Ebay noted AEST instead of daylight saving time... so I'm thinking you might have had another hour. Not that you'd want to risk it.
If they have postage amounts listed for each item, perhaps pay for both separately just to get some discount out of it... and if they are an honourable seller, they will refund the excess postage later. And if they don't ask them for it if it is an excessive difference.
If they do refund the difference, you'll end up getting the full 20% discount, plus combined shipping.
If the timing really is EAST and not DST, you still have 25 minutes left.