@Yeti,
Your repeated references to 'dates' made me extremely nervous - had I inadvertently said something I shouldn't have, and not noticed? - and I went back and looked at everything very carefully.
It's all right actually. Nothing to worry about; just an elderly man's quibbles.
You mentioned one date, 1206 to 1707, which I kind of agreed with, but not enthusiastically, not fully, not whole-heartedly, if you get what I mean. The reason was that while I agreed with the 1206, in spite of the thread originator having stated clearly that he wanted that considered, I wasn't happy with the 1707; both my reactions surprised myself actually.
The first date was Iltutmish; he was the first to rule from within India, although a deft debater would point out that a larger view of south Asia would include Afghanistan, and therefore would include both Ghor and Ghazni, would force consideration of both Ghurid and Ghaznavid, and would push things back a couple of centuries.
A parochial view would even say that bin Qasim should be taken into consideration, even though his contribution to history was so much more ephemeral, precisely because a parochial view was being taken, and the old British historical perspective of Hindu India, Muslim India and British India were being adopted. This is how I was taught, by the way, as this is how the demarcations are done in Calcutta University even today. Personally, I would prefer to take a non-parochial view based on social, economic and political development and analyses, and would seek rather more meaningful dates.
However, as it happens, I agreed with one of your sets of dates partially; that pair of dates was the closest fit that I found in your various listings.
The problem was with the second date, again a date proposed and validated by the British: this was the death of Aurangzeb i n 1707, and I do think that putting everything after that event into British history is a bit of cheek at best, considering development of the country, misleading as well.
I would personally prefer a date of 1857, as the Mughal Empire lingered on till then, and it was unfinished business. That is what I meant by a discrepancy of 150 years, not that your date-pairs were wrong, but that my preference of the second date in this sequence was one 150 years later.
Sorry for the unnecessary hullabaloo. This happens when you make the mistake of letting elderly people ride their hobby horses.