Snape Timeline....

[ZaraG]

No: HPFGUIDX 188597

> Bart:
>     Secondarily, there has been an assumption that nobody knows about 
> Snape's heroism in VW II. Can anybody give me a reason why Harry 
> wouldn't have revealed that Snape was a hero? He didn't have the give 
> the motive, even if he wanted to preserve Snape's privacy (he made no 
> promise to do so).

Zara:
I am mystified as to where such an opinion is coming from. Harry declared both the heroism and the motive for it in front of a Who's Who in the Wizarding World, in the final chapter of DH.

Regarding your estimate of how long Snape was a spy in the first war, I lean towards a year rather than 6 months. The war ended on October 31 with the failure of Voldemort's attempt to kill Harry. Six months prior would be the end of April, not particularly a time of year we would expect the scenery we get in Snape's first meeting with Dumbledore. ("...forlorn and cold in the darkness, the wind whistling through the branches of a few leafless trees.")