IT'S TOMORROW! Re: 20th may, Historical date!

[alexandre wajnberg]

> Le mercredi, 11 mai 2005, à 20:44 Europe/Brussels, Richard Guy a écrit 
> :
>
> A little over 30 years ago, almost all nations agreed (...) on the 
> (adoption and) use of the "metric system".
>  For example, April 7, 1975, is expressed as 1975 04 07.
> ----------------------
>> On Wed, 11 May 2005, Alonso Del Arte wrote:
>>
>> As much sense as DDMMYYYY makes (smallest unit to largerst unit), 
>> many of us live where MMDDYYYY is more prevalent, or even MMDDYY, as 
>> well as miles and gallons. So here 20 May 2005 is 5/20/2005, hardly 
>> special from the point of view of symmetry. Alonso
----------------------------------------

Hello,

1) Following these constructive remarks, I submit the symmetrical dates 
in the two other systems (considered as numbers, in increasing order):

(european DDMMYYYY was allready done: A106605)

MMDDYYYY (american; OEIS):

10011001 10025001 10052001 10088001 10100101 10111101 10125101
10152101 10188101 10200501 10211501 10225501 10252501 10288501
11011011 11025011 11052011 11088011 11100111 11111111 11125111
11152111 11188111 11200511 11211511 11225511 11252511 11288511
12011051 12025051 12052051 12088051 12100151 12111151 12125151
12152151 12188151 12200551 12211551 12225551 12252551 12288551


YYYYMMDD (metric system)

10011001 10100101 10111101 10200501 10500201 10511201 10800801
11011011 11100111 11111111 11200511 11500211 11511211 11800811
15011021 15100121 15111121 15200521 15500221 15511221 15800821
20011005 20100105 20111105 20200505 20500205 20511205 20800805
21011015 21100115 21111115 21200515 21500215 21511215 21800815
25011025 25100125 25111125 25200525 25500225 25511225 25800825
50011002 50100102 50111102 50200502 50500202 50511202 50800802
51011012 51100112 51111112 51200512 51500212 51511212 51800812
55011022 55100122 55111122 55200522 55500222 55511222 55800822
80011008 80100108 80111108 80200508 80500208 80511208 80800808
81011018 81100118 81111118 81200518 81500218 81511218 81800818
85011028 85100128 85111128 85200528 85500228 85511228 85800828

Here, the increasing order is also the chronological order (which is 
not the case for the two others, american and european ones).


If somebody wants to add the YYYYDDMM to complete the thing and/or 
verify (I made it by hand...)

---------------------------

2) Now for the double symmetric dates, we have (omitting the zero 
beginning dates):
—Only two american MMDDYYYY ones: 10011001, 11111111
—Only two metric notations YYYYMMDD: 10011001, 11111111
+ the three european DDMMYYYY ones: 10011001, 11111111, 20052005
(+ the three YYYYDDMM: 10011001, 11111111, 20052005)


I understand the mental difficulties to change of reference system! (in 
Europe, we have the euros replacing our national moneys, and it's a 
pain in the ...), but for those of you who missed "oct. 1st 1001" and 
"nov. 11th 1111", it IS the last occasion, at least in one system, to 
live and share such a date!
So we, "DDMMYYYY people", invite you; feel free to join us! Cheers!


Alexandre

A merry
non-symetrical 0520th2005 (beginning with zéro ;-)
AND symmetrical 20052005


PS:
As the "condensed american MMDDYY" is (symetrical, increasing):
101101 102501 111111 112511 121151 122551   (finite, full),

and the "condensed european DDMMYY" (symetrical, increasing, finite, 
full) is:
101101 111111 121151 151121 181181 201105 211115 221155 251125 281185,

it appears that we will be united on the double-symmetric "Nov 11th 11"!
And we will re-invite you on the "18 nov 81".

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