January 1 ?

[mark]

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.)

 

[Guest]

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

 

[Lew Pitcher]

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)

 

[Dik T. Winter]

>
> 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.

 

[Arthur J. O'Dwyer]

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

 

[Richard Tobin]

Jan 1st, 1 AD was Sunday or Saturday ?

[/QUOTE]

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

 

[Kenneth Brody]

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.

[...]

 

[Keith Thompson]

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.

 

[Mark McIntyre]

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.[/QUOTE]

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?

 

[Martin Ambuhl]

On 15 Jun 2004 14:38:59 GMT, in comp.lang.c , (e-mail address removed)
(Richard Tobin) wrote:


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.

 

[E. Robert Tisdale]

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.)

> cal 1 0001

January 1
Su Mo Tu We Th Fr Sa
1
2 3 4 5 6 7 8
9 10 11 12 13 14 15
16 17 18 19 20 21 22
23 24 25 26 27 28 29
30 31

> cal -j 1 0001

January 1
Sun Mon Tue Wed Thu Fri Sat
1
2 3 4 5 6 7 8
9 10 11 12 13 14 15
16 17 18 19 20 21 22
23 24 25 26 27 28 29
30 31

> cal 9 1752

September 1752
Su Mo Tu We Th Fr Sa
1 2 14 15 16
17 18 19 20 21 22 23
24 25 26 27 28 29 30

 

[Charles Richmond]

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.)

If you want to pretend that the Gregorian calendar extended
back to 1 AD, then January 1st would have been a Monday. So
would January 1st in 401, 801, 1201, 1601, 2001, 2401, etc.
also be Mondays. That is because in each of these 400 year
periods, there is a whole number of weeks.

--
+-------------------------------
| Charles and Francis Richmond
| richmond at plano dot net
| Re-Defeat Bush!!!
+-------------------------------

 

[Dik T. Winter]

> In article <[email protected]>,

>
> You only have to consider calendars in which the term "1 AD" makes
> sense, which narrows it down a bit.

Ah, which calendar is that? As far as I now there was only one 1 Jan
in 1 AD, and neither extrapolation through the Gregorian calendar nor
extrapolation through the Julian calendar will give you the correct day.

 

[Dik T. Winter]

> January 1
> Sun Mon Tue Wed Thu Fri Sat
> 1
> 2 3 4 5 6 7 8

I do not think this gives what you think it is giving; try cal -j 2 0001.

> September 1752
> Su Mo Tu We Th Fr Sa
> 1 2 14 15 16

Ah, yes... Now if cal recognised the country where you were, much more
interesting would have been 'cal 2 1712' in Sweden.

 

[E. Robert Tisdale]

I do not think this gives what you think it is giving; try cal -j 2 0001.


Ah, yes... Now if cal recognised the country where you were,
much more interesting would have been 'cal 2 1712' in Sweden.

HISTORY
A cal command appeared in Version 6 AT&T UNIX.

cal is a UNIX program.
It will produce the same output in Sweden that it does in the U.S.A.

 

[CBFalconer]

.... snip ...

HISTORY
A cal command appeared in Version 6 AT&T UNIX.

cal is a UNIX program. It will produce the same output in
Sweden that it does in the U.S.A.

An amazing display of ignorance by the thick headed troll. Do you
want to explain it to it, or just leave it to wallow in its own
excrement? If you explain, use nothing more subtle than a hefty
wood splitting maul.

 

[E. Robert Tisdale]

An amazing display of ignorance by the thick headed troll.
Do you want to explain it to it,
or just leave it to wallow in its own excrement?
If you explain,
use nothing more subtle than a hefty wood splitting maul.

Get help Chuck.

 

[Joona I Palaste]

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

An amazing display of ignorance by the thick headed troll. Do you
want to explain it to it, or just leave it to wallow in its own
excrement? If you explain, use nothing more subtle than a hefty
wood splitting maul.

I'll try. Can't you read, Trollsdale? To make it easier for you I've
underlined the part you missed.

 

[Richard Bos]

Ah, which calendar is that?

The proleptic Gregorian calendar, and the Julian calendar with proleptic
AD year numbering.

As far as I now there was only one 1 Jan
in 1 AD, and neither extrapolation through the Gregorian calendar nor
extrapolation through the Julian calendar will give you the correct day.

There was never a 1 AD. At the time, it was called 753 (give or take a
year) AUC, or the thatmuchth year of the emperor Augustus, or whoever
was consul back then. Any date you put to it is a backformation.

Richard

 

[Dik T. Winter]

>
> The proleptic Gregorian calendar, and the Julian calendar with proleptic
> AD year numbering.

The interesting thing about it is that they would differ about the day to
which they point as January 1. And both would point to a day which actually
was not a January 1 at that time.