[NTG-context] playing with dates

[NTG-context] playing with dates

[Pablo Rodriguez via ntg-context]

Dear list,

I would like to be able to design some calendars.

Is there any way to have a command (Lua or ConTeXt) that can increase or
decrease a given date by days (something like \nextday or \previousday).

I have tried \date and \increment or \decrement, as shown in the wiki:

  \starttext
  Today is \currentdate.

  \dorecurse{25}
  {\increment\normalday}

  Tomorrow will be \currentdate.

  \decrement\normalday

  %\increment\normalmonth% -- gives an error
  \increment\normalyear

  And today in a year will be \currentdate.
  \stoptext

But the main problem is that I end up having the improbable day of
December 41st, 2024 (with \decrement\normalday, it would read -9th).

Besides, \normalmonth cannot be incremented or decremented (although
this would be useless for me).

Is there any way to get a command that can increment or decrement by
days a given date?

Many thanks for your help,

Pablo
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[NTG-context] Re: playing with dates

[Henning Hraban Ramm]

Am 16.12.24 um 19:05 schrieb Pablo Rodriguez via ntg-context:
> I would like to be able to design some calendars.

While this doesn’t answer your question, did you try Willi’s calendar 
modules, as outlined in
https://articles.contextgarden.net/journal/2022.html ?
I guess the code also contains date calculations.

Hraban

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[NTG-context] Re: playing with dates

[Pablo Rodriguez via ntg-context]

On 12/16/24 19:36, Henning Hraban Ramm wrote:
> Am 16.12.24 um 19:05 schrieb Pablo Rodriguez via ntg-context:
>> I would like to be able to design some calendars.
>
> While this doesn’t answer your question, did you try Willi’s calendar
> modules, as outlined in
> https://articles.contextgarden.net/journal/2022.html ?
> I guess the code also contains date calculations.
Hi Hraban,

it doesn’t fit my needs (which are way different from his pocket diary).

Having a command that increases or days (according to the calendar)
avoids me having to implement the whole logic.

Besides, I think \normalday could be way more useful if it could
increment the whole date, not only the day number.

I must admit that I barely understand how \normalday behaves like any
other counter.

Pablo
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[NTG-context] Re: playing with dates

[Wolfgang Schuster]

Pablo Rodriguez via ntg-context schrieb am 16.12.2024 um 19:05:
> Dear list,
>
> I would like to be able to design some calendars.
>
> Is there any way to have a command (Lua or ConTeXt) that can increase or
> decrease a given date by days (something like \nextday or \previousday).
>
> I have tried \date and \increment or \decrement, as shown in the wiki:
>
>    \starttext
>    Today is \currentdate.
>
>    \dorecurse{25}
>    {\increment\normalday}
>
>    Tomorrow will be \currentdate.
>
>    \decrement\normalday
>
>    %\increment\normalmonth% -- gives an error
>    \increment\normalyear
>
>    And today in a year will be \currentdate.
>    \stoptext
>
> But the main problem is that I end up having the improbable day of
> December 41st, 2024 (with \decrement\normalday, it would read -9th).
>
> Besides, \normalmonth cannot be incremented or decremented (although
> this would be useless for me).
>
> Is there any way to get a command that can increment or decrement by
> days a given date?

https://www.mail-archive.com/ntg-context@ntg.nl/msg88605.html

Wolfgang

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[NTG-context] Re: playing with dates

[vm via ntg-context]

On 16/12/2024 21:03, Pablo Rodriguez via ntg-context wrote:
> Besides, I think \normalday could be way more useful if it could
> increment the whole date, not only the day number.


does this help?

https://www.lua.org/pil/22.1.html


 > nn = os.date("*t", os.time{year=2024, month=12+15, day=16+19})
 > nn.year, nn.month, nn.day


To produce a date table, we use the format string "*t". For instance, 
the following code

     temp = os.date("*t", 906000490)

produces the table

     {year = 1998, month = 9, day = 16, yday = 259, wday = 4,
      hour = 23, min = 48, sec = 10, isdst = false}


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[NTG-context] Re: playing with dates

[Pablo Rodriguez via ntg-context]

On 12/16/24 21:21, Wolfgang Schuster wrote:
> Pablo Rodriguez via ntg-context schrieb am 16.12.2024 um 19:05:
>> [...]
>> Is there any way to get a command that can increment or decrement by
>> days a given date?
>
> https://www.mail-archive.com/ntg-context@ntg.nl/msg88605.html

Many thanks for your reply, Wolfgang.

I‘m afraid that approach is too complex for me to implement a full
calendar of previous, current and next year.

I have tried that, but only the required xtable seems too complicated to
me (using xtables).

Pablo
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[NTG-context] Re: playing with dates

[Pablo Rodriguez via ntg-context]

On 12/16/24 21:30, vm via ntg-context wrote:
> On 16/12/2024 21:03, Pablo Rodriguez via ntg-context wrote:
>> Besides, I think \normalday could be way more useful if it could
>> increment the whole date, not only the day number.
>
> does this help?
>
> https://www.lua.org/pil/22.1.html

I’m afraid not, because I wonder how to typeset a whole year with that
os.date() and os.time() functions.

I mean, a huge xtable that contains 12 months, with a variable number of
weeks and days each, placing each day number in weeks from Monday to Sunday.

I cannot even get a header with the correct year number (although I know
how to invoke that, I get 2028 instead of 2024 [probably because of
for-loops]).

It seems that it is too complex for me (and I have already invested two
afternoons in this).

For some reason, not meant to be in my case,

Pablo
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[NTG-context] Re: playing with dates

[Wolfgang Schuster]

Pablo Rodriguez via ntg-context schrieb am 16.12.2024 um 22:18:
> On 12/16/24 21:30, vm via ntg-context wrote:
>> On 16/12/2024 21:03, Pablo Rodriguez via ntg-context wrote:
>>> Besides, I think \normalday could be way more useful if it could
>>> increment the whole date, not only the day number.
>> does this help?
>>
>> https://www.lua.org/pil/22.1.html
> I’m afraid not, because I wonder how to typeset a whole year with that
> os.date() and os.time() functions.
>
> I mean, a huge xtable that contains 12 months, with a variable number of
> weeks and days each, placing each day number in weeks from Monday to Sunday.
>
> I cannot even get a header with the correct year number (although I know
> how to invoke that, I get 2028 instead of 2024 [probably because of
> for-loops]).
>
> It seems that it is too complex for me (and I have already invested two
> afternoons in this).
>
> For some reason, not meant to be in my case,

Use trialtypesetting in a table when you perform calculations etc.

\starttext

\startxtable
   \startxrow
     \startxcell
       \startmode[*trialtypesetting]
         123456789
       \stopmode
       \startnotmode[*trialtypesetting]
         123
        %123\rlap{\lightgray 456789}
       \stopnotmode
     \stopxcell
   \stopxrow
\stopxtable

\startxtable
   \startxrow
     \startxcell
       \doifelsemode{*trialtypesetting}
         {123456789}
         {123}
        %{123\rlap{\lightgray 456789}}
     \stopxcell
   \stopxrow
\stopxtable

\startxtable
   \startxrow
     \startxcell
       \iftrialtypesetting
         123456789
       \else
         123
        %123\rlap{\lightgray 456789}
       \fi
     \stopxcell
   \stopxrow
\stopxtable

\stoptext

Wolfgang

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[NTG-context] Re: playing with dates

[vm via ntg-context]

On 16/12/2024 22:18, Pablo Rodriguez via ntg-context wrote:
> It seems that it is too complex for me (and I have already invested two
> afternoons in this).
> 
> For some reason, not meant to be in my case,

like everyday for one year

8<---

\startluacode
function userdata.now(dd)
   local wdays = {"Sun ", "Mon ", "Tue ", "Wed ", "Thu ", "Fri ", "Sat "}
   local z = os.date("*t", os.time())
   local nn = os.date("*t", os.time{year=z.year, month=z.month, 
day=z.day+dd})
   --context(wdays[nn.wday] .. nn.year .. "-" .. nn.month .. "-" .. nn.day)
   context(string.format("%s %04d-%02d-%02d ", wdays[nn.wday], nn.year, 
nn.month, nn.day))
end
\stopluacode
\starttext
\tt
Today is \ctxlua{userdata.now(0)}

\dorecurse{366}{\ctxlua{userdata.now(\recurselevel)}\\ }

\stoptext

--->8



( i'm not fluent in lua, so there might be a much better way to handle 
it ;-)

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[NTG-context] Re: playing with dates

[Aditya Mahajan]

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On Mon, 16 Dec 2024, Pablo Rodriguez via ntg-context wrote:
> I‘m afraid that approach is too complex for me to implement a full
> calendar of previous, current and next year.

tikz has various macros to typeset calendars:

\usemodule[tikz]
\usetikzlibrary[calendar]

\starttext
\starttikzpicture
  \calendar[dates=2025-01-01 to 2025-04-last,week list,
            month label above centered];
\stoptikzpicture
\stoptext

Also see https://tikz.dev/library-calender and https://texample.net/tikz/examples/feature/calendar-library/ (which, in principle, can be translated to ConTeXt rather easily).

Aditya

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[NTG-context] Re: playing with dates

[vm via ntg-context]

On 16/12/2024 22:18, Pablo Rodriguez via ntg-context wrote:
> For some reason, not meant to be in my case,

In your terminal, one line fits all ;-)


T="cal2025.tex" && echo "\\starttext\\startTEXpage\\starttyping" >${T} 
&& cal 2025 >>${T} && echo "\\stoptyping\\stopTEXpage\\stoptext" >>${T} 
&& context ${T}


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[NTG-context] Re: playing with dates [oneliner]

[vm via ntg-context]

or if you want the days:

Y=2025 && T="ncal${Y}.tex" && echo 
"\\setuppapersize[A3]\\starttext\\startTEXpage[offset=5mm]\\starttyping" 
 >${T} && ncal ${Y} >>${T} && echo "\\stoptyping\\stopTEXpage\\stoptext" 
 >>${T} && context ${T}

;-)
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[NTG-context] Re: playing with dates

[Pablo Rodriguez via ntg-context]

On 12/16/24 22:52, Wolfgang Schuster wrote:
> Pablo Rodriguez via ntg-context schrieb am 16.12.2024 um 22:18:
>> [...]
>> I cannot even get a header with the correct year number (although I know
>> how to invoke that, I get 2028 instead of 2024 [probably because of
>> for-loops]).
>> [...]
> Use trialtypesetting in a table when you perform calculations etc.

Many thanks for the info, Wolfgang.

This is something I need to keep in mind when I get weird results in loops.

Many thanks for your help,

Pablo
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[NTG-context] Re: playing with dates

[Pablo Rodriguez via ntg-context]

On 12/17/24 10:02, vm via ntg-context wrote:
> On 16/12/2024 22:18, Pablo Rodriguez via ntg-context wrote:
>> For some reason, not meant to be in my case,
>
> In your terminal, one line fits all ;-)
>
> T="cal2025.tex" && echo "\\starttext\\startTEXpage\\starttyping" >${T}
> && cal 2025 >>${T} && echo "\\stoptyping\\stopTEXpage\\stoptext" >>${T}
> && context ${T}

Many thanks for your three suggestions, vm.

They would be a way to start doing it, but fortunately there is a proper
calendar solution.

Many thanks for your help,

Pablo
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[NTG-context] Re: playing with dates

[Pablo Rodriguez via ntg-context]

On 12/16/24 23:49, Aditya Mahajan wrote:
> On Mon, 16 Dec 2024, Pablo Rodriguez via ntg-context wrote:
>> I‘m afraid that approach is too complex for me to implement a full
>> calendar of previous, current and next year.
>
> tikz has various macros to typeset calendars:
> [...]
> Also see https://tikz.dev/library-calender and https://texample.net/
> tikz/examples/feature/calendar-library/ (which, in principle, can be
> translated to ConTeXt rather easily).

Hi Aditya,

many thanks for the reference: this solves all my needs (see below).

It would be great (as per
https://texample.net/tikz/examples/birthday-calendar/) to have automatic
Easter calculation.

I guess Lua code would be easier to write, but I cannot get how each
Easter Sunday may be computed.

Many thanks for your help and excuse my crappy (but functional) code,

Pablo


\unprotect
\permanent\tolerant\protected\def\translate[#1]%
  {\getparameters[\??translation][#1]%
   \ifcsname\??translation\currentlanguage\endcsname
     \lastnamedcs
   \orelse\ifcsname\??translation\s!en\endcsname
     \lastnamedcs
   \else
     #1%
   \fi}
\protect

\usemodule[tikz]
\usetikzlibrary[calendar]
\setupbodyfont[palatino]
\def\pgfcalendarmonthname#1{%
  \translate{\ifcase#1\or Enero\or Febrero\or Marzo\or Abril\or
    Mayo\or Junio\or Julio\or Agosto\or Septiembre\or Octubre\or
    Noviembre\or Diciembre\fi}%
}

\starttext

\startbuffer
\setupheadertexts[\framed[frame=off, foregroundstyle=\bfd, width=1tw,
align=outer,]{\recursestring}]
\startlayout[standard][align=center]
\startxtable[frame=off]
\ctxlua{document.rcount = 1}
\dorecurse{4}
{\startxrow[toffset=1st]
\dorecurse{3}
{\startxcell
\starttikzpicture
  \calendar(mycal)[dates=\recursestring-\cldcontext{document.rcount}-01
to \recursestring-\cldcontext{document.rcount}-last, week list,
            month label above left,
            month text={\feature[+][smallcaps]\%mt},
            ]
            if (Sunday,
            equals=2025-04-20,
            equals=2025-04-18,
            equals=2025-04-19,
            equals=01-01,
            equals=01-06,
            equals=02-22,
            equals=05-01,
            equals=07-28,
            equals=08-15,
            equals=09-9,
            equals=09-15,
            equals=11-1,
            equals=12-6,
            equals=12-8,
            equals=12-25,
            equals=02-22) [font=\bf];
\stoptikzpicture
\stopxcell\ctxlua{document.rcount = document.rcount + 1}
\startxcell[width={\ifnum\recurselevel <3 .04675tw\else 0tw\fi}]
\stopxcell}
\stopxrow}
\stopxtable
\stoplayout
\stopbuffer

\doloopoverlist{2050}
  {\getbuffer}
\stoptext
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[NTG-context] Re: playing with dates

[Henning Hraban Ramm]

Am 17.12.24 um 16:44 schrieb Pablo Rodriguez via ntg-context:
> It would be great (as per
> https://texample.net/tikz/examples/birthday-calendar/) to have automatic
> Easter calculation.
> 
> I guess Lua code would be easier to write, but I cannot get how each
> Easter Sunday may be computed.

Hi Pablo, you didn’t follow my suggested links.

While Willi’s “main” module PocketDiary doesn’t fit your needs, the 
calculations and examples for other kinds of calendars are all there.

https://modules.contextgarden.net/dl/PocketDiary-V2.zip
https://modules.contextgarden.net/dl/Collection-of-calendars-based-on-PocketDiary-module.zip
https://modules.contextgarden.net/dl/Date-driven-lists.zip

Hraban
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[NTG-context] Re: playing with dates

[Thomas A. Schmitz]

> On 17. Dec 2024, at 16:44, Pablo Rodriguez via ntg-context <ntg-context@ntg.nl> wrote:
> 
> I guess Lua code would be easier to write, but I cannot get how each
> Easter Sunday may be computed.

Here you go:

a = math.fmod(year,19)

b = math.floor(year / 100)

c = math.fmod(year,100)

d = math.floor(b / 4)

e = math.fmod(b,4)

f = math.floor((b + 8) / 25) 

g = math.floor((b - f + 1) / 3)

h = math.fmod((19 * a + b - d - g + 15),30)

i = math.floor(c / 4)

k = math.fmod(c,4)

L = math.fmod((32 + 2 * e + 2 * i - h - k),7)

m = math.floor((a + 11 * h + 22 * L) / 451)

eastersundaymonth = math.floor((h + L - 7 * m + 114) / 31)

eastersunday = math.fmod((h + L - 7 * m + 114),31) + 1

Thomas
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[NTG-context] Re: playing with dates

[Pablo Rodriguez via ntg-context]

On 12/17/24 17:09, Henning Hraban Ramm wrote:
> Am 17.12.24 um 16:44 schrieb Pablo Rodriguez via ntg-context:
>> It would be great (as per
>> https://texample.net/tikz/examples/birthday-calendar/) to have automatic
>> Easter calculation.
>>
>> I guess Lua code would be easier to write, but I cannot get how each
>> Easter Sunday may be computed.
>
> Hi Pablo, you didn’t follow my suggested links.

Sorry, Hraban, I followed the only link I got in my message.

What I completetely overlooked was that there were two more articles by
Willi about PocketDiary.

I thought the first article was the module presentation for the new version.

I had mistakenly thought that that first article was all it was about that.

Apologies for my hurried reading (also to Willi),

Pablo
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[NTG-context] Re: playing with dates

[Pablo Rodriguez via ntg-context]

On 12/17/24 18:58, Thomas A. Schmitz wrote:
>> On 17. Dec 2024, at 16:44, Pablo Rodriguez via ntg-context <ntg-context@ntg.nl> wrote:
>> I guess Lua code would be easier to write, but I cannot get how each
>> Easter Sunday may be computed.
>
> Here you go:

Many thanks for your help, Thomas.

Pablo
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[NTG-context] Re: playing with dates

[Willi Egger]

Hi Pablo,

never mind!

Dealing with date calculations is a tedious job. Calculating the easter date as provided by Thomas is a clean way, however I do not know where the algorithm comes from. — What i used in my module is a translation of a BASIC-programme, developed by Ron Mallen, Australia, in 1985. The code represents a direct translation of the formerly used tables for this purpose. Mallen’s method claims to be 100% accurate…

The easter calculation is a function in my module which is only depending on the year, so you could easily pull it out and use it independently from the module.

I hope you will succeed managing your calendars in due time :-)

Kind regards
Willi

> On 17 Dec 2024, at 22:04, Pablo Rodriguez via ntg-context <ntg-context@ntg.nl> wrote:
> 
> On 12/17/24 17:09, Henning Hraban Ramm wrote:
>> Am 17.12.24 um 16:44 schrieb Pablo Rodriguez via ntg-context:
>>> It would be great (as per
>>> https://texample.net/tikz/examples/birthday-calendar/) to have automatic
>>> Easter calculation.
>>> 
>>> I guess Lua code would be easier to write, but I cannot get how each
>>> Easter Sunday may be computed.
>> 
>> Hi Pablo, you didn’t follow my suggested links.
> 
> Sorry, Hraban, I followed the only link I got in my message.
> 
> What I completetely overlooked was that there were two more articles by
> Willi about PocketDiary.
> 
> I thought the first article was the module presentation for the new version.
> 
> I had mistakenly thought that that first article was all it was about that.
> 
> Apologies for my hurried reading (also to Willi),
> 
> Pablo
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