Kevin, please correct me if I am wrong, but I respectfully submit that although the dates you give are correct, I just want to add one thing:  This is based on the time in Israel, according to their religious calendar.  Their days begin on the evening of the previous day, which starts at sundown (based on Genesis, “there was night, and there was day”).  For example, their Saturday Sabbath begins at sundown, Friday.

 

You wrote:

 

“Rosh Hashanah begins in the evening of Sunday, 16 September 2012, and ends in the evening of Tuesday, 18 September 2012.”

 

According to the Jewish calendar online, Sunday, September 16 is Rosh Hashanah EVE.  Rosh Hashanah is a 2-day holiday.  The first day of Rosh Hashanah is Monday, September 17, but it begins on Sunday, September 16, at sundown, Israel time, which is approximately 6:00 or 7:00 p.m. (Not sure which.)  That is when they will start looking for the first appearance of the crescent of the New Moon.  As soon as it is spotted by 2 witnesses, they blow the shofar (that is “the Last Trump”) to announce the New Year has begun. So, depending on where you’re located, the best way to calculate the time is to use UT.  I live on the Pacific coast of America.  In Israel, 6:00 p.m. Sunday, September 16, (which is the start of Monday September 17 in Israel), is 9:00 a.m. Sunday, Pacific Daylight time.  Thus, the 17^th of September in Israel goes from 6:00 pm Sunday the 16^th through 6:00 pm Monday, the 17^th.  The 18^th of September begins at 6:00 p.m. Monday the 17^th and ends sundown Tuesday the 18^th.

 

I hope this makes sense. 

 

Diane G.