Ken,
Thinking about this one, maybe we should exercise "discretionary powers" here.
Graeme did an adequate job of providing the answer for By George and if he had read the trend of the thread before posting he would have kept an eye on it.
Therefore your suggestion of 1718Z looks realistic - after all we do have a stalled thread and it's boring.
At that time it will be 0118A in Singapore. I shall do nothing until I hear from you.