Thank you for the suggested workaround.
Is it possible to define that operation in a tiddler and then refer to the
value in a template for creating a new journal entry?
If so, maybe one could also use JavaScript directly to provide the value
for the tiddler template.
lördag 11 september 2021 kl. 15:19:35 UTC+2 skrev cj.v:
> * Oops, typo in the last "search-replace" *
>
> "[Thu],[7]" should be "[Sun],[7]"
>
> The dangers of mindless cut and paste ...
>
> On Saturday, September 11, 2021 at 12:49:23 AM UTC-3 Charlie Veniot wrote:
>
>> G'day,
>>
>> Just to get the conversation started, try this in a new tiddler in some
>> tiddlywiki:
>>
>> <$vars dateNow= <<now wYYYY-W0WW-ddd>>>
>>
>> {{{
>> [<dateNow>search-replace:[Mon],[1]search-replace:[Tue],[2]search-replace:[Wed],[3]search-replace:[Thu],[4]search-replace:[Fri],[5]search-replace:[Sat],[6]search-replace:[Thu],[7]]
>>
>> }}}
>>
>> </$vars>
>>
>> On Thursday, September 9, 2021 at 4:57:30 PM UTC-3 J N wrote:
>>
>>> A correction of the example given for a week date in TiddlyWiki is that
>>> the template should use the wYYYY token for the ISO week-numbering year,
>>> not YYYY, since weeks may cross the traditional year boundary with some
>>> days of the week falling outside the year the week belongs to. It is a bit
>>> surprising that the final element of the week day number is missing when
>>> the other parts of the ISO standard are supported.
>>>
>>> torsdag 9 september 2021 kl. 21:31:46 UTC+2 skrev J N:
>>>
>>>> I would like to use the ISO week date format for the title of new
>>>> journal tiddlers and elsewhere, since I find it practical to be aware of
>>>> the week day in combination with a sortable date format.
>>>>
>>>> https://en.wikipedia.org/wiki/ISO_8601#Week_dates
>>>> YYYY-Www-D or YYYYWwwD
>>>>
>>>> E.g. 2021-w36-4 for thursday of week 36, 2021-09-09.
>>>>
>>>> I can not see a way to get the week day number in the built in date
>>>> format tokens.
>>>>
>>>> https://tiddlywiki.com/#DateFormat
>>>>
>>>> The closest I've got is YYYY-W0WW-ddd, but that renders as
>>>> 2021-W36-Thu, which will not sort alphanumerically in date order like an
>>>> ISO date would.
>>>>
>>>> I can see that the template tokens are implemented in a system tiddler
>>>> named $:/core/modules/utils/utils.js.
>>>>
>>>> Getting the day of week is trivial in JavaScript, e.g. adding a token
>>>> matching a single "D" for this:
>>>>
>>>> [/^D/, function() {
>>>> return date.getDay() || 7;
>>>> }]
>>>>
>>>> The utils.js tiddler seems to contain a lot of other stuff however, and
>>>> I guess local changes would have to be merged on achieving updates of
>>>> TiddlyWiki.
>>>>
>>>> Maybe there are other ways to achieve custom date formatting of this
>>>> kind in TiddlyWiki?
>>>>
>>>
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