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Posted by Kevin on 10/04/93 11:11
Dear Jochem and all the others who have offered help,
Thank you all for your assistance! Thanks to all of you I have been able to
reach the next step in the design process!
Thanks ever so much!
Most sincerely,
Kevin
"Jochem Maas" <jochem@iamjochem.com> wrote in message
news:4239F4A0.7040500@iamjochem.com...
> Kevin wrote:
> > Dear mr. Maas,
>
> no need for 'mr' :-)
>
> >
> > First of all my appologies for taking so long to respond. I had a family
> > death to attend to.
>
> my condolences.
> there is no need to apologise in any case.
>
> ...
>
> >>
> >>why is OBC relevant, I read later on that you take the start of egyptian
> >>civilization as zero. is that not much earlier.
> >
> >
> > Well it's relevant to make a baseline so that I can calculate the
difference
> > from then until now. That's the only reason thusfar.
> >
> >
> >>whats the structure of the egyptian|rpg calendar?
> >
> >
> > A year consists of 769 days, 13 months of 63 days a month, except for
month
> > 13 which has 14 days. Every month has 7 weeks of 9 days, of course month
13
> > is the exception. A day is 24 hours.
> >
>
> a few thoughts:
>
> 1. you have a date in both calendars which represent the same day?
> and/or rather what is day zero in the egyptian calendar in the gregorian
> calendar?
>
> 2. maybe you should store the date internally as number of days since
zero,
> where zero is the first day on the egyptian calendar ......
>
> er, checking this thread again, Richard Lynch puts it better than I can so
> I'll just let you read his answer (again?) and hope it helps!
>
>
> oh one last thing: I notice that in the function you posted you did this:
>
>
> # Calculating the year in Egypt.
> $yr_Egypt = floor($EgyptianDays / 769);
> # Calculating the Month in Egypt.
> $mnt_Egypt = round( ($EgyptianDays-($yr_Egypt*769)) / 63 );
> # Calculating the Day in Egypt.
> $dy_Egypt = round( $EgyptianDays - (($yr_Egypt * 769) + ($mnt_Egypt
* 63)) );
> # Filling the date array variable with the day, month and year of the
> Egyptian calendar.
> $ec_date["Day"] = $dy_Egypt;
> $ec_date["Month"] = $mnt_Egypt;
> $ec_date["Year"] = $yr_Egypt;
> # Returning the Calculated date.
> return $ec_date;
>
> which could be written more succinctly as:
>
>
> /* Calculating the year,month,day in Egypt and returning. */
> return array (
> "Year" => ($y = floor( $EgyptianDays / 769 )),
> "Month" => ($m = round( ($EgyptianDays - ($y * 769)) / 63 )),
> "Day" => round( $EgyptianDays - (($y * 769) + ($m * 63)) ),
> );
>
> that might inspire you to use less variables in your code, which is a good
thing - but in this
> case completely beside the point. whats less beside the point is that you
use floor() for the year
> and round() for the day and month, I wonder if it helps if you use floor()
for all 3?
>
> beware of floating point rounding errors, compare:
>
> <?php
>
> $EgyptianDays = 10345;
>
> var_dump(
>
> array(
> "Year" => ($y = floor( $EgyptianDays / 769 )),
> "Month" => ($m = floor( ($EgyptianDays - ($y * 769)) / 63 )),
> "Day" => floor( $EgyptianDays - (($y * 769) + ($m * 63)) ),
> ),
>
> array(
> "Year" => ($y = floor( $EgyptianDays / 769 )),
> "Month" => ($m = round( ($EgyptianDays - ($y * 769)) / 63 )),
> "Day" => round( $EgyptianDays - (($y * 769) + ($m * 63)) ),
> )
>
> );
>
> ?>
>
> kind regards,
> Jochem
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