Julian to Gregorian calendar switch? – On this day... Review

Love the App, but I was asked by a friend if it takes into account the switch between Julian to Gregorian calendar. I could not find the answer but noticed discrepancy between what the App says as date for Charlemagne coronation as King of Franks and what Wikipedia says. Is the difference due to that?
Review by KCMOVIP on On this day....

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