Exact dates for holidays

The length of time from the new tally of years beginning with the Years of the Trees to the Years of the Sun is 1,500 Valian Years. What if that were exactly 14,400 mortal ones, or 100 Long Valian Years? What if it were exactly 4,320 mortal years from the Awakening of the Elves to the Years of the Sun, or exactly 30 Long Valian Years?

A timeline assuming a Valian Year is 9.6 Mortal Years.
The dates are for the first day of the first year.

Valian Year Mortal Year

1 Thursday, February 24, 59,551 BC
1501 Wednesday, March 2, 45,151 BC

Years of the Lamps

1901 Tuesday, March 4, 41,311 BC
3401 Thursday, March 13, 26,911 BC
3451 Saturday, March 14, 26,431 BC

Years of the Trees

3501 Monday, March 14, 25,951 BC
4501 Sunday, March 20, 16,351 BC

First Age

4551 Saturday, March 18, 15,871 BC
4581 Tuesday, March 20, 15,583 BC
4586 Saturday, March 20, 15,535 BC
4591 Wednesday, March 21, 15,487 BC
4601 Monday, March 19, 15,391 BC
4606 Friday, March 19, 15,343 BC
4616 Saturday, March 20, 15,247 BC
4626 Sunday, March 20, 15,151 BC
4631 Thursday, March 20, 15,103 BC
4641 Tuesday, March 18, 15,007 BC
4651 Wednesday, March 19, 14,911 BC
4661 Thursday, March 20, 14,815 BC
4666 Monday, March 20, 14,767 BC
4671 Friday, March 20, 14,719 BC
4686 Sunday, March 19, 14,575 BC
4691 Thursday, March 19, 14,527 BC
4701 Friday, March 20, 14,431 BC
4731 Friday, March 19, 14,143 BC
4751 Sunday, March 20, 13,951 BC
4781 Sunday, March 20, 13,663 BC
4801 Tuesday, March 21, 13,471 BC
4831 Tuesday, March 20, 13,183 BC
4851 Thursday, March 22, 12,991 BC
4861 Friday, March 23, 12,895 BC
4901 Saturday, March 22, 12,511 BC
4911 Thursday, March 20, 12,415 BC
4951 Monday, March 23, 12,031 BC
4971 Sunday, March 21, 11,839 BC
4991 Tuesday, March 23, 11,647 BC
4996 Saturday, March 23, 11,599 BC

Years of the Sun

5001 Sunday, March 20, 11,551 BC

First day of the year in Elvish Reckoning.

Wednesday, March 28, 2001.
Thursday, March 28, 2002.
Friday, March 28, 2003.
Saturday, March 27, 2004.
Sunday, March 27, 2005 (Easter Sunday).
Monday, March 27, 2006.
Tuesday, March 27, 2007.
Wednesday, March 26, 2008.
Thursday, March 26, 2009.
Monday, March 29, 2010.
Tuesday, March 29, 2011.
Wednesday, March 28, 2012.
Thursday, March 28, 2013.
Friday, March 28, 2014.
Saturday, March 28, 2015.
Sunday, March 27, 2016 (Easter Sunday).
Monday, March 27, 2017.
Tuesday, March 27, 2018.
Wednesday, March 27, 2019.
Thursday, March 26, 2020.
Friday, March 26, 2021.
Tuesday, March 29, 2022.
Wednesday, March 29, 2023.
Thursday, March 28, 2024.
Friday, March 28, 2025.
Saturday, March 28, 2026.
Sunday, March 28, 2027 (Easter Sunday).
Monday, March 27, 2028.
Tuesday, March 27, 2029.
Wednesday, March 27, 2030.
Thursday, March 27, 2031.
Friday, March 26, 2032 (Good Friday).
Saturday, March 26, 2033.
Wednesday, March 29, 2034.
Thursday, March 29, 2035.
Friday, March 28, 2036.
Saturday, March 28, 2037.
Sunday, March 28, 2038.
Monday, March 28, 2039.
Tuesday, March 27, 2040.
Wednesday, March 27, 2041.
Thursday, March 27, 2042.
Friday, March 27, 2043 (Good Friday).
Saturday, March 26, 2044.
Sunday, March 26, 2045.
Thursday, March 29, 2046.
Friday, March 29, 2047.
Saturday, March 28, 2048.
Sunday, March 28, 2049.
Monday, March 28, 2050.
Tuesday, March 28, 2051.
Wednesday, March 27, 2052.
Thursday, March 27, 2053.
Friday, March 27, 2054 (Good Friday).
Saturday, March 27, 2055.
Sunday, March 26, 2056 (Palm Sunday).
Monday, March 26, 2057.
Friday, March 29, 2058.
Saturday, March 29, 2059 (Holy Saturday).
Sunday, March 28, 2060.
Monday, March 28, 2061.
Tuesday, March 28, 2062.
Wednesday, March 28, 2063.
Thursday, March 27, 2064.
Friday, March 27, 2065 (Good Friday).
Saturday, March 27, 2066.
Sunday, March 27, 2067 (Palm Sunday).
Monday, March 26, 2068.
Tuesday, March 26, 2069.
Saturday, March 29, 2070 (Holy Saturday).
Sunday, March 29, 2071.
Monday, March 28, 2072.
Tuesday, March 28, 2073.
Wednesday, March 28, 2074.
Thursday, March 28, 2075.
Friday, March 27, 2076.
Saturday, March 27, 2077.
Sunday, March 27, 2078 (Palm Sunday).
Monday, March 27, 2079.
Tuesday, March 26, 2080.
Wednesday, March 26, 2081.
Sunday, March 29, 2082.
Monday, March 29, 2083.
Tuesday, March 28, 2084.
Wednesday, March 28, 2085.
Thursday, March 28, 2086.
Friday, March 28, 2087.
Saturday, March 27, 2088.
Sunday, March 27, 2089 (Palm Sunday).
Monday, March 27, 2090.
Tuesday, March 27, 2091.
Wednesday, March 26, 2092.
Thursday, March 26, 2093.
Monday, March 29, 2094.
Tuesday, March 29, 2095.
Wednesday, March 28, 2096.
Thursday, March 28, 2097.
Friday, March 28, 2098.
Saturday, March 28, 2099.
Sunday, March 28, 2100 (Easter Sunday).

I've often suspected that Tolkien calculated Durin's Day in a manner similar to Easter. As most everyone knows,
Easter is the first Sunday following the first full moon after the spring equinox. Durin's Day is usually thought to be the visible
new moon right before the cross-quarter moment of Samhain; that is, the mid-point between the autumnal equinox and the
winter solstice. But what if we also take into account the day of the week?

'Tomorrow begins the last week of autumn,' said Thorin one day.

The Hobbit, Ch XI.

The Saturday following the new moon can be called Durin's Saturday. It is always, coincidentally, 23 weeks and a day before the next Easter Sunday.

Dates for Durin's Saturday.

November 4, 2000.
October 20, 2001.
November 9, 2002.
November 1, 2003 (All Saints Day).
October 16, 2004.
November 5, 2005.
October 28, 2006.
October 13, 2007.
November 1, 2008 (All Saints Day).
October 24, 2009.
November 13, 2010.
October 29, 2011.
October 20, 2012.
November 9, 2013.
October 25, 2014.
October 17, 2015.
November 5, 2016.
October 21, 2017.
November 10, 2018.
November 2, 2019 (All Souls Day).
October 24, 2020.
November 6, 2021.
October 29, 2022.
October 21, 2023.
November 9, 2024.
October 25, 2025.
October 17, 2026.
November 6, 2027.
October 21, 2028.
November 10, 2029.
November 2, 2030 (All Souls Day).
October 18, 2031.
November 6, 2032.
October 29, 2033.
October 14, 2034.
November 3, 2035.
October 25, 2036.
November 14, 2037.
October 30, 2038.
October 22, 2039.
November 10, 2040.
October 26, 2041.
October 18, 2042.
November 7, 2043.
October 29, 2044.
October 14, 2045.
November 3, 2046.
October 26, 2047.
November 7, 2048.
October 30, 2049.
October 22, 2050.
November 11, 2051.
October 26, 2052.
October 18, 2053.
November 7, 2054.
October 23, 2055.
November 11, 2056.
November 3, 2057.
October 19, 2058.
November 8, 2059.
October 30, 2060.
October 15, 2061.
November 4, 2062.
October 27, 2063.
October 18, 2064.
October 31, 2065.
October 23, 2066.
November 12, 2067.
November 3, 2068.
October 19, 2069.
November 8, 2070.
October 31, 2071.
October 15, 2072.
November 4, 2073.
October 27, 2074.
November 9, 2075.
October 31, 2076.
October 23, 2077.
November 12, 2078.
October 28, 2079.
October 19, 2080.
November 8, 2081.
October 24, 2082.
October 16, 2083.
November 4, 2084.
October 20, 2085.
November 9, 2086.
November 1, 2087.
October 23, 2088.
November 5, 2089.
October 28, 2090.
October 20, 2091.
November 1, 2092.
October 24, 2093.
November 13, 2094.
November 5, 2095.
October 20, 2096.
November 9, 2097.
November 1, 2098.
October 17, 2099.

Happy Durin's Day everyone!