Sure lets talk about Pekhawar:
http://khyberplus.multiply.com/journal/item/5
Before the close of the seventh century a new race-the Afghans or Pathans-appeared upon the scene. This people are first heard of as holding the hills of Ghor and Suliman about the middle of the seventh century A. D. at the time when Persia first succumbed to the force of Mohammadan arms. Against the Arab wave of conquest the Pathans appear not only to have held their own but also to have commenced about the same period a series of attacks upon their Indian neighbours of the countries bordering on the Indus. Ferishta records a campaign of 70 pitched battles in five months when in the event the Pathans succeeded in wresting a portion of the plain country near the Indus from the Rajahs of Lahore. Joined later by the Gakkars who at this period held all the country from the Indus to the Jhelum the Pathans c. 700 A. D. compelled the Lahore rulers to cede to them all the hill country west of the Indus and south of the Kabul River on condition of their guarding that frontier of Hindustan against invasion.
Even after this date however the plain of Peshawar and apparently the Jalalabad plain still further west together with the hills to the north including modern Swat, Buner, etc., were occupied by tribes connected with India who appear to have been left un-molested. In the 10th century Peshawar came for-the first time under foreign yoke when Sabuktagin of Ghazni defeated Jaipal, the Hindu Prince of Lahore, near Laghman in Afghanistan and drove his armies across the Indus with great slaughter (978 A. D.). The conqueror took possession of all the country west of the Indus and left his Lieutenant Abu All as Governor of Peshawar with an army of 10,000 horses.In this campaign the Pathans sided with Sabuktagin and furnished soldiers to his army.
Is 10th century good enough for you? Also, this debunks your theory about Pakhtuns spreading to east of the Durand after conversion to Islam.
If hindko is a native language to Pekhawar valley why has it been reduced to the status of a ‘punjabi varient’ spoke by ‘punjabi pathans’? I put those words in quotes because that is what many linguists and scholars believe. I mean Punjabi, Sindhi, and Baluchi all have been able to survive despite wars, immigration, and catastrophes. I am not here to insult Hindko or people who speak the language, but to call it the native langauge of Pekhawar may be more of myth to link the people to the area, than anything else.