Today is New Year's Day 2014.

(Happy and healthy New Year to all.)

1/1/2014

1+1+2+0 = 1*4

(I know that's poor, but I needed something there.)

2014 is BBC in base 13.

Today: 1 + 13 = 14 or 13 + 1 = 14

Today, Jan 14, 2014

1 = [SUP]14[/SUP]/[SUB]14[/SUB]
1 + 14 + 14 = 29 = Prime
1 + 14 + 2014 = 2029 = Prime

Missed posting on Jan 15:

15 - 1 = 14 (all UK style and all)
1 * ( 15 + 14 ) = 29 = Prime

Jan 16:

1 + 16 + 14 = 31 = Prime
16 - 14 + 1 = 3 = Prime

16+14-1=29 prime :razz: (exponent of the third "composite mersenne")
16*14-1=223 prime :razz: (divides the forth "composite mersenne") hehe... etc...

[edit: 2^16+1 fermat prime, still didn't decide what to do with 14 in this case...]

[edit 2: ok, 14<<16-1=917503. prime :w00t: hehe]

Today is 1/24/2014.

Aka 24/01/2014.

Hence 2401 ~ 2014.

Same digits, permuted.

(Have to ask, too tired to compute:
From 2000 to 2999, how many such are there?
What about from 1000 to 9999?)

[QUOTE=davar55;365271](Have to ask, too tired to compute:
From 2000 to 2999, how many such are there?
What about from 1000 to 9999?)[/QUOTE]

For years 2000 through 2999, I get 866 such dates. This assumes identity permutations are allowed. There are 119 exact matches for DDMM with the 4-digit year in this period (none for MMDD), if you care about that.

For years 1000 through 9999, I get 4023 such dates. I assume either Julian or Gregorian calendar, and year number always changing on January 1.

Today Jan 30, 14
(30 mod 14 ) + 1 = 3 = prime

Some holidays that we should note (this list is for handy reference):
square root of 2 day: January 14, 2042 (14/1/42), the best was 1/4/1421
e Day: February 7 (2/7) or January 27 (27/1), especially in 2018, even better was 2/7/1828
pi day: March 14 (3/14), best was 3/14/1592
pi approximation day: July 22 (22/7)
other pi day alternatives:[INDENT]March 4: When 14% of the 3rd month has elapsed.
April 5: When 3.14 months of the year have elapsed.
April 26: The Earth has traveled two radians of its orbit on this day (April 25 in leap years). This is celebrated exactly on the 41st second of the 23rd minute of the 4th hour on April 26 or the 116th day. (In leap years, it is celebrated exactly on the 3rd second of the 2nd minute of the 12th hour on April 25 or the 116th day.)
November 10: The 314th day of the year (November 9 in leap years).
December 21, 1:13 p.m.: The 355th day of the year (December 20 in leap years), celebrated at 1:13 for the Chinese approximation 355/113[/INDENT][URL="http://en.wikipedia.org/wiki/Square_Root_Day"]Square root day[/URL]: April 4, 2016
[URL="http://en.wikipedia.org/wiki/Programmers'_Day"]Programmers' Day[/URL]: the 256th (hexadecimal 100th, or the 2[SUP]8[/SUP]th) day of the year (September 13 most years, September 12 leap years)
[URL="http://en.wikipedia.org/wiki/Mole_Day"]Mole Day[/URL]: October 23, between 6:02 AM and 6:02 PM
Fibonacci sequence day: Nov 23, especially 11/23/5813