April 1 - Eastern Orthodox liturgical calendar - April 3
All fixed commemorations below are observed on April 15 by Orthodox Churches on the Old Calendar. [note 1]
For April 2nd, Orthodox Churches on the Old Calendar commemorate the Saints listed on March 20 .
Mar. 31 - Eastern Orthodox liturgical calendar - Apr. 2
April 2 - Eastern Orthodox liturgical calendar - April 4
April 3 - Eastern Orthodox liturgical calendar - April 5
All fixed commemorations below are observed on April 18 by Eastern Orthodox Churches on the Old Calendar.
April 5 — Eastern Orthodox liturgical calendar — April 7
April 7 - Eastern Orthodox liturgical calendar - April 9
April 10 - Eastern Orthodox liturgical calendar - April 12
April 11 - Eastern Orthodox liturgical calendar - April 13
April 12 - Eastern Orthodox liturgical calendar - April 14
April 13 - Eastern Orthodox liturgical calendar - April 15
April 14 - Eastern Orthodox liturgical calendar - April 16
April 15 - Eastern Orthodox liturgical calendar - April 17
April 16 - Eastern Orthodox liturgical calendar - April 18
Apr. 23 - Eastern Orthodox liturgical calendar - Apr. 25
April 24 - Eastern Orthodox liturgical calendar - April 26
April 25 - Eastern Orthodox liturgical calendar - April 27
April 17 - Eastern Orthodox liturgical calendar - April 19
April 18 - Eastern Orthodox liturgical calendar - April 20
April 28 - Eastern Orthodox liturgical calendar - April 30
March 19 - Eastern Orthodox liturgical calendar - March 21
Greek Sources
Russian Sources