There are differences of opinion about how to determine the dates of the beginning of the year and the dates of the Lord’s commanded to keep holy days (for His set apart people). I’ve studied and, for now at least, this way of Scriptural understanding is what i believe. However, the dates (not the holy days) should not be a divisive issue.
How to calculate the calendar.
1) A year begins at the first new moon after the vernal equinox.
2) A month starts at the sundown after the lunar conjunction.
See our teachings “Calendar Confusion” and “The Calendar” to learn more.
Shavuot explained by TorahFamily.org.
“Regardless of when the first resurrection takes place, may we
always make sure we are living the life our savior is calling us to
walk in. May we always walk in His love. The love that He said all
men would know we are His disciples. Are you walking in that love
Remember, people won’t know you are His disciples because you
follow the right calendar. People won’t know you are His disciples
because you say His name right. People won’t know you are His
disciples because you can quote verses. People will know you are
His disciples because of your love.
Walk in His love today as we continually watch and pray for His
Blessings & Shalom!”