WP 31S available at SourceForge

[Dieter]

(04-18-2014 07:20 AM)walter b Wrote:  Back to start, please. WP 31S shall be an entry level scientific (incorporating a subset of WP 34S firmware). I don't see how Julian day numbers with all the bells and whistles never seen in any calculator before shall foster that.

No bells and whistles required here. But accurate results are not optional. Never. That's why it can't stay the way it is: the 31s currently returns dubious results because the Julian day number - which is used for three date-related commands - is calculated in a way that's wrong for most users.

JG1582 (which should be the 34s default) and JG1752 are better than nothing, and obviously memory restrictions on the 34s did not allow a better, complete solution. But the 31s can have a perfect implementation for correct results under all circumstances. As already stated earlier: "accuracy is not optional".

Something like a JGSET command seems to be not the worst idea. It allows correct results (WDAY, ΔDAYS, DAYS+) for all users. And as an additional benefit it extends the functionality in that it allows calculations based on a proleptic Julian or Gregorian calendar (cf. ISO 8601). I do not see any reason why this should not get implemented. I suggest 15 Oct 1582 should be the default switch date (as usual in calendar calculations), and the user may specify any other.

Pauli, now it's up to you. ;-)

Dieter