Yes Darwin released his theory of evolution in 1858 AD and published it in 1859 exactly 150 years after this date is 2008 or 2009 AD.
If each day is a month being 30 days and if one day can be used to signify one year in Bible prophecy, as has been used by the Lord before in Numbers 14:34 and Ezekiel 4:6. then the 5 months in Revelations 9:5 would end in 2008/2009 with the return of the Lord.
The sting like a scorpion, in Revelations 9 is referring to disbelief in God or skepticism. Of course this disbelief and skeptism will end when the Lord returns, as 'every knee shall bow'. But first there must be a nuclear war unfortunately.