And the Lord spake unto Moses, saying, Speak unto the children of Israel, and say unto them, Concerning the feasts of the Lord, which ye shall proclaim to be holy convocations, even these are my feasts.
Leviticus 23:1-2 (KJV)

God's Holy Day Calendar

* Begins evening before
++ Observed evening before

 Roman Year : 2018 Date  Roman Year : 2019 Date
Passover *++ Mar 30 (F) Passover *++ Apr 19 (F)
Days of Unleavened Bread * Mar 31-Apr 6 (SA-F) Days of Unleavened Bread * Apr 20-26 (SA-F)
Pentecost* May 20 (Su) Pentecost* Jun 9 (Su)
Feast of Trumpets* Sep 10 (M) Feast of Trumpets* Sep 30 (M)
Day of Atonement* Sep 19 (W) Day of Atonement* Oct 9 (W)
Feast of Tabernacles* Sep 24-30 (M-SU) Feast of Tabernacles* Oct 14-20 (M-SU)
Last Great Day* Oct 1 (M) Last Great Day* Oct 21 (M)

 Roman Year : 2020 Date  Roman Year : 2021 Date
Passover *++ Apr 8 (W) Passover *++ Mar 28 (Sa)
Days of Unleavened Bread * Apr 9-15 (Th-W) Days of Unleavened Bread * Mar 28-Apr 3 (Su-Sa)
Pentecost* May 31 (Su) Pentecost* May 16 (Su)
Feast of Trumpets* Sep 19 (Sa) Feast of Trumpets* Sep 7 (TU)
Day of Atonement* Sep 29 (M) Day of Atonement* Sep 16 (Th)
Feast of Tabernacles* Oct 3-9 (SA-F) Feast of Tabernacles* Sep 21-27 (Tu-M)
Last Great Day* Oct 10 (Sa) Last Great Day* Sep 28 (Tu)