The ability to name the day of the week of any given date in just a few seconds. This ability is rare and seen in savants and has no satisfactory explanation. See idiot savant.

CALENDAR CALCULATION: "Calendar calculation is rae but no one knows why some people can do it."
Cite this page: N., Pam M.S., "CALENDAR CALCULATION," in, April 7, 2013, (accessed November 28, 2020).