On most calendars this year Shavuot 2023 will begin at sundown on Thursday, May 25, 2023, and end the evening of Saturday, May 27, 2023, based on most Hebrew, Jewish and Messianic calendars used today. In the Christian world this day is known as Pentecost which is Greek for 50th.
On God’s biblical calendar, the name of this month is “Sivan” (May-June) which is the third month on HIS calendar, and this year Shavuot (Pentecost) falls on Friday, Sivan 6th (May 26)
In the world of Christendom, Shavuot / Pentecost generally is celebrated on a Sunday and not on the actual day of the historical event. Many churches will observe Pentecost on a Sunday in May regardless of the calendar date and celebrate the descent of the Holy Spirit in the Upper Room in Jerusalem which they also call the “Birth of the Church.”