Days of the Omer 866 - 7 weeks from the second night of Pesach to the day before Shavuot

Days of the Omer 866 / סְפִירַת הָעוֹמֶר 4626

Warning! Results for year 1752 C.E. and earlier may be inaccurate.
Hebcal does not take into account a correction of ten days that was introduced by Pope Gregory XIII known as the Gregorian Reformation. ^[1]

7 weeks from the second night of Pesach to the day before Shavuot ㊾

Days of the Omer for Hebrew Year 4626 began on Thursday, 8 April 0866 and ended on Thursday, 27 May 0866.

Counting of the Omer (or Sefirat Ha’omer, Hebrew: ספירת העומר) is a verbal counting of each of the forty-nine days between the Jewish holidays of Passover and Shavuot. This mitzvah derives from the Torah commandment to count forty-nine days beginning from the day on which the Omer, a sacrifice containing an omer-measure of barley, was offered in the Temple in Jerusalem, up until the day before an offering of wheat was brought to the Temple on Shavuot. The Counting of the Omer begins on the second day of Passover (the 16th of Nisan) for Rabbinic Jews, and after the weekly Shabbat during Passover for Karaite Jews, and ends the day before the holiday of Shavuot, the ‘fiftieth day.’.

Read more from Judaism 101 or Wikipedia

Dates for Days of the Omer

Holiday	Starts	Ends	Hebrew Dates
Days of the Omer 863	ThursdayThu, April 12Apr 12	ThursdayThu, May 31May 31	16 Nisan - 5 Sivan 4623
Days of the Omer 864	SundaySun, March 30Mar 30	SundaySun, May 18May 18	16 Nisan - 5 Sivan 4624
Days of the Omer 865	SaturdaySat, April 18Apr 18	SaturdaySat, June 6Jun 6	16 Nisan - 5 Sivan 4625
Days of the Omer 866	ThursdayThu, April 8Apr 8	ThursdayThu, May 27May 27	16 Nisan - 5 Sivan 4626
Days of the Omer 867	TuesdayTue, March 29Mar 29	TuesdayTue, May 17May 17	16 Nisan - 5 Sivan 4627
Days of the Omer 868	SundaySun, April 15Apr 15	SundaySun, June 3Jun 3	16 Nisan - 5 Sivan 4628
Days of the Omer 869	ThursdayThu, April 4Apr 4	ThursdayThu, May 23May 23	16 Nisan - 5 Sivan 4629
Days of the Omer 870	TuesdayTue, March 25Mar 25	TuesdayTue, May 13May 13	16 Nisan - 5 Sivan 4630
Days of the Omer 871	TuesdayTue, April 14Apr 14	TuesdayTue, June 2Jun 2	16 Nisan - 5 Sivan 4631
Days of the Omer 872	SaturdaySat, April 2Apr 2	SaturdaySat, May 21May 21	16 Nisan - 5 Sivan 4632
Days of the Omer 873	TuesdayTue, March 21Mar 21	TuesdayTue, May 9May 9	16 Nisan - 5 Sivan 4633