Years with Same Calendar as 666

Year:Country:

The year 666 had 365 days and started on a Perşembe (Turkey, Julian calendar).

This country was still using the Julian calendar in 666. In that calendar system, a Leap Day was added every four years, without the exceptions defined in today's Gregorian calendar. The Gregorian calendar was introduced in 1926.

Years with same starting weekday and equal number of days to 666
Year	Compared to year 666	Since last
571	95 years before
582	84 years before	+ 11 years
593	73 years before	+ 11 years
599	67 years before	+ 6 years
610	56 years before	+ 11 years
621	45 years before	+ 11 years
627	39 years before	+ 6 years
638	28 years before	+ 11 years
649	17 years before	+ 11 years
655	11 years before	+ 6 years
666	selected year	+ 11 years
677	11 years after	+ 11 years
683	17 years after	+ 6 years
694	28 years after	+ 11 years
705	39 years after	+ 11 years
711	45 years after	+ 6 years
722	56 years after	+ 11 years
733	67 years after	+ 11 years
739	73 years after	+ 6 years
750	84 years after	+ 11 years
761	95 years after	+ 11 years
20 years share the calendar of year 666 in the 200-year time span from 566 to 765. Note that holidays will not match exactly. Selected year is highlighted.

Which Years Have the Same Calendar?

Reuse your yearly calendar by finding years that have the same number of days and start on the same day of the week.

Find months that have the same number of days and start on the same day of the week.

Do you feel dates like Friday the 13th occur often? This calculator tells you exactly when.