1752 is a weird year by any reckoning. The legal date of the year was reformed January 1, but the days were not removed from the calendar until September (omitting 3-13). So between January and September the date was partially new style (Year begins January 1) and partially old style (11 days behind the Gregorian calendar). Between March 25 and September the dates would LOOK like old style dates (because after March 25 both ecclesiastical and civil years coincided).
Of course to someone on the continent, the day that an as-yet-to-be-completely-reformed English person called Febryart 29,1752 would correspond to March 11, 1752.
Remember that leap years are calculated by the ecclesiastical year and not the civil year.