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 : 2017 Date  Roman Year : 2018 Date
Passover *++ April 10 (M) Passover *++ March 30 (F)
Days of Unleavened Bread * April 11-17 (Tu-M) Days of Unleavened Bread * March 31-April 6 (SA-F)
Pentecost* June 4 (Su) Pentecost* May 20 (Su)
Feast of Trumpets* Sept. 21 (Th) Feast of Trumpets* Sept. 10 (M)
Day of Atonement* Sept. 30 (Sa) Day of Atonement* Sept. 19 (W)
Feast of Tabernacles* Oct. 5-11 (Th-W) Feast of Tabernacles* Sept. 24-30 (M-SU)
Last Great Day* Oct. 12 (Th) Last Great Day* Oct. 1 (M)

 Roman Year : 2019 Date  Roman Year : 2020 Date
Passover *++ April 19 (F) Passover *++ April 8 (W)
Days of Unleavened Bread * April 20-26 (SA-F) Days of Unleavened Bread * April 9-15 (Th-W)
Pentecost* June 9 (Su) Pentecost* May 31 (Su)
Feast of Trumpets* Sept. 30 (M) Feast of Trumpets* Sept. 19 (Sa)
Day of Atonement* Oct. 9 (W) Day of Atonement* Sept. 29 (M)
Feast of Tabernacles* Oct. 14-20 (M-SU) Feast of Tabernacles* Oct. 3-9 (SA-F)
Last Great Day* Oct. 21 (M) Last Great Day* Oct. 10 (Sa)