I have been working on a hypothetical Daniel’s timeline for the final “week” of 7 years prophecy (using dispensational/literal interpretation of days in the timeline) described in Daniel/Revelation. I am using the Hebrew feast days, holidays, and other possible prophetic events as guidelines for the spacing of literal days. I was able to put together this figure for educational purposes. However, I found a discrepancy between the Yom Kippur feast day dates given at Hebcal.com vs. Torahcalendar.com in 2024. The dates differ by one whole month – roughly YK Oct 12, 2024 vs. YK Sept 12, 2024. I can’t find any real explanation about this discrepancy. Hebcal.com seems to be correct with the Hebrew leap years. The differences in how the sites make calculations does not seem to account for a whole month difference in dates. Does anyone have an explanation for the date differences in this case?
P.S. Torahcalendar.com is not used by Jews for the most part. I believe it is Messianic Christian in origin. They don't give contact information. I do not think this question asked from a Christian perspective would be appreciated on the Judaism stack exchange.