There maybe some level of confusion here regarding TTF's, Metar's & Speci's.
The BOM's web site has an excellent "Knowledge Centre" for a top up of some knowledge we could all do from time to time
As 'FFrats' has pretty much alluded to here a TTF is a Forecast with a validity period ( & can be used for planing purposes) where as a Metar or Speci on it's own is a kind of 'snap shot' of the current WX with an issue time only
Wmk2