Jan 1st, 1 AD was Sunday or Saturday ?
(question is related to C as I am writing a program (in C) to
calculate days/dates and need a starting point from where to start
counting.)
27  1768 
mark wrote: Jan 1st, 1 AD was Sunday or Saturday ?
In which calendar?
Julian ? Gregorian? A different one...?
(question is related to C as I am writing a program (in C) to
calculate days/dates and need a starting point from where to start
counting.)
Perhaps is better to start with Friday October 15, 1582 as day #1 !
- Dario
mark wrote: Jan 1st, 1 AD was Sunday or Saturday ?
Under which calendar, and in which country? It matters.
FWIW, the "Gregorian" calendar under which we currently operate didn't
exist prior to the mid-1700's. Before that, a variety of calendars were
in use, and which calendar depended on which country. Think "year after
the founding of Rome", for instance.
(question is related to C as I am writing a program (in C) to
calculate days/dates and need a starting point from where to start
counting.)
--
Lew Pitcher, IT Consultant, Enterprise Application Architecture
Enterprise Technology Solutions, TD Bank Financial Group
(Opinions expressed here are my own, not my employer's)
In article <DN************ *******@news20. bellglobal.com> Lew Pitcher <Le*********@td .com> writes: mark wrote: Jan 1st, 1 AD was Sunday or Saturday ?
Under which calendar, and in which country? It matters.
FWIW, the "Gregorian" calendar under which we currently operate didn't
exist prior to the mid-1700's.
Let's make that 1582.
--
dik t. winter, cwi, kruislaan 413, 1098 sj amsterdam, nederland, +31205924131
home: bovenover 215, 1025 jn amsterdam, nederland; http://www.cwi.nl/~dik/
On Tue, 15 Jun 2004, Dik T. Winter wrote:
Lew Pitcher <Le*********@td .com> writes: mark wrote: Jan 1st, 1 AD was Sunday or Saturday ?
Under which calendar, and in which country? It matters.
FWIW, the "Gregorian" calendar under which we currently operate didn't
exist prior to the mid-1700's.
Let's make that 1582.
Ah, yes. "Not all of Usenet was part of the British Empire in the
sixteenth century." ;-) But Lew's right that the Gregorian calendar
under which *we* currently operate didn't exist prior to 1752... before
then it was a Gregorian calendar under which we didn't operate! :)
The OP might be better served by just figuring out the current date
and backtracking according to whatever algorithm he's using. For
example, if he's using the rule "leap year every four years except
centuries except 400-year centuries," then his "January 1st" will
fall on a Sunday, I think.
[Windows tells me that 1 Jan 2000 was a Sunday, and Google tells
me that
(2000/4 - 2000/100 + 2000/400 + 2000*365) mod 7 = 0
Thus I conclude that 1 Jan 0000 was a Sunday. And yes, I know there
was no 1 Jan 0000. I don't think the OP will care as long as his
program works.]
Of course, there's only seven possibilities. The OP might as well
employ trial and error --- only one of the seven possibilities for
"January 1st" will produce the correct day of the week for today.
-Arthur
In article <DN************ *******@news20. bellglobal.com> ,
Lew Pitcher <Le*********@td .com> wrote: Jan 1st, 1 AD was Sunday or Saturday ?
Under which calendar, and in which country? It matters.
FWIW, the "Gregorian" calendar under which we currently operate didn't
exist prior to the mid-1700's. Before that, a variety of calendars were
in use, and which calendar depended on which country. Think "year after
the founding of Rome", for instance.
You only have to consider calendars in which the term "1 AD" makes
sense, which narrows it down a bit.
-- Richard
"Arthur J. O'Dwyer" wrote:
On Tue, 15 Jun 2004, Dik T. Winter wrote:
Lew Pitcher <Le*********@td .com> writes: mark wrote:
> Jan 1st, 1 AD was Sunday or Saturday ?
Under which calendar, and in which country? It matters.
FWIW, the "Gregorian" calendar under which we currently operate didn't
exist prior to the mid-1700's.
Let's make that 1582.
Ah, yes. "Not all of Usenet was part of the British Empire in the
sixteenth century." ;-) But Lew's right that the Gregorian calendar
under which *we* currently operate didn't exist prior to 1752... before
then it was a Gregorian calendar under which we didn't operate! :)
It existed. *We* just didn't use it yet.
[...]
--
+-------------------------+--------------------+-----------------------------+
| Kenneth J. Brody | www.hvcomputer.com | |
| kenbrody at spamcop.net | www.fptech.com | #include <std_disclaimer .h> |
+-------------------------+--------------------+-----------------------------+
"Arthur J. O'Dwyer" <aj*@nospam.and rew.cmu.edu> writes:
[...] Ah, yes. "Not all of Usenet was part of the British Empire in the
sixteenth century." ;-) But Lew's right that the Gregorian calendar
under which *we* currently operate didn't exist prior to 1752... before
then it was a Gregorian calendar under which we didn't operate! :)
No calendar under which *I* operate existed prior to 1959.
--
Keith Thompson (The_Other_Keit h) ks***@mib.org <http://www.ghoti.net/~kst>
San Diego Supercomputer Center <*> <http://users.sdsc.edu/~kst>
We must do something. This is something. Therefore, we must do this.
On 15 Jun 2004 14:38:59 GMT, in comp.lang.c , ri*****@cogsci. ed.ac.uk
(Richard Tobin) wrote: In article <DN************ *******@news20. bellglobal.com> ,
Lew Pitcher <Le*********@td .com> wrote:
Jan 1st, 1 AD was Sunday or Saturday ?
Under which calendar, and in which country? It matters.
FWIW, the "Gregorian" calendar under which we currently operate didn't
exist prior to the mid-1700's. Before that, a variety of calendars were
in use, and which calendar depended on which country. Think "year after
the founding of Rome", for instance.
You only have to consider calendars in which the term "1 AD" makes
sense, which narrows it down a bit.
ISTR that Romans (and many other kingdoms, empires etc) counted from the
year of acension of the Emperor. How many emperors, kings etc began with a
D?
--
Mark McIntyre
CLC FAQ <http://www.eskimo.com/~scs/C-faq/top.html>
CLC readme: <http://www.angelfire.c om/ms3/bchambless0/welcome_to_clc. html>
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Mark McIntyre wrote: On 15 Jun 2004 14:38:59 GMT, in comp.lang.c , ri*****@cogsci. ed.ac.uk
(Richard Tobin) wrote: You only have to consider calendars in which the term "1 AD" makes
sense, which narrows it down a bit.
ISTR that Romans (and many other kingdoms, empires etc) counted from the
year of acension of the Emperor. How many emperors, kings etc began with a
D?
The Latinates among us will remember that "a.d." stands for "ante diem"
as well, as in "ante diem quartum Idus Martias." The number of possible
"1 AD" dates is quite large. This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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