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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