It doesn't say so in so many words, but if he was born no more than a few days before the battle of Glen Shiel and was six months old before the end of the year (assuming a January New Year, of course!), then it must be June. I'm glad you like the idea :D
And that's a very good point about the different calendars—I may add a note to the post clarifying that these are all Old Style dates. And you've cleared up a minor mystery for me—I was sure I'd read that New Year's Day was 25 March until the 1750s, but my Jacobite history books (which generally say something about Old and New Style dates) never mentioned it, and the contemporary writings I've seen always seemed to assume a January New Year. But if it was only England which had the 25 March New Year, not Scotland, then that makes perfect sense.
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And that's a very good point about the different calendars—I may add a note to the post clarifying that these are all Old Style dates. And you've cleared up a minor mystery for me—I was sure I'd read that New Year's Day was 25 March until the 1750s, but my Jacobite history books (which generally say something about Old and New Style dates) never mentioned it, and the contemporary writings I've seen always seemed to assume a January New Year. But if it was only England which had the 25 March New Year, not Scotland, then that makes perfect sense.