executing org-table TBLFM form changes (resets) language settings - seems a calc related issue

[Rainer Stengele <rainer.stengele@online.de>]

Am 25.01.2018 um 14:30 schrieb Rainer Stengele:
> All,
> 
> My current-language-environment is "German".
> Having an Org table with a TBLFM attached:
> 
> | IM Startzeit          | IM Endezeit           | Stunden | delta(x,16) | Anm. |
> |-----------------------+-----------------------+---------+-------------+------|
> | [2018-01-22 Mo 19:30] | [2018-01-23 Di 14:30] |   19.00 |        3.00 |      |
> |                       |                       |         |             |      |
> #+TBLFM: $3=24*(date(<$2>)-date(<$1>)); %.2f::$4=$3-16.0; %.2f
> 
> entering a new timestamp correctly inserts German dayname abbrevs: ("Do", German for "Thu", English):
> 
> | IM Startzeit          | IM Endezeit           | Stunden | delta(x,16) | Anm. |
> |-----------------------+-----------------------+---------+-------------+------|
> | [2018-01-22 Mo 19:30] | [2018-01-23 Di 14:30] |   19.00 |        3.00 |      |
> | [2018-01-25 Do 14:19] |                       |         |             |      |
> #+TBLFM: $3=24*(date(<$2>)-date(<$1>)); %.2f::$4=$3-16.0; %.2f
> 
> Executing the TBLFM line with C-c C-c changes (resets) the language environment to English.
> 
> Now inserting a timestamp inserts "Thu" instead of "Do", that is it uses the English day name abbrevs:
> 
> | IM Startzeit          | IM Endezeit           |      Stunden |  delta(x,16) | Anm. |
> |-----------------------+-----------------------+--------------+--------------+------|
> | [2018-01-22 Mo 19:30] | [2018-01-23 Di 14:30] |        19.00 |         3.00 |      |
> | [2018-01-25 Thu 14:21]|                       |              |              |      |
> #+TBLFM: $3=24*(date(<$2>)-date(<$1>)); %.2f::$4=$3-16.0; %.2f
> 
> Believe me it took me some time to find out what action in Emacs changes the whole lang environment.
> 
> Is that a bug or is there a language setting in the TBLFM form?
> 
> Thanks for any hint.
> 
> Regards,
> Rainer
> 
Hi,

I have asked the g.e.orgmode newsgroup to try to help me with the issue described above
Unfortunately this seems to be a calc related item and I kindly ask a calc expert to try to help out.

Summarising as far as I understand: The "calc-date" function does seem to change the language settings.
After some advice I tried to set the following variables manually but that even ended in #ERROR entries in my table after calculating the 
TBLFMT line:

(setq math-long-weekday-names '( "Sonntag" "Montag" "Dienstag" "Mittwoch" "Donnerstag" "Freitag" "Samstag" ))
(setq math-short-weekday-names '( "Son" "Mon" "Die" "Mit" "Don" "Fre" "Sam" ))


Any help is appreciated.

Thank you.
Regards, Rainer