Post Script;
I believe this proposed validatedate operator would would unlock the
possibility of a lot of date handling without the inclusion of more complex
date handling plugins etc...
Just to explain a little further using nested range operators it would be
possible to generate any number of years, months and days such as from 1 to
31 days and have the proposed validate eliminate invalid dates. This would
be good for producing date tiddlers or rejecting invalid date entries eg
[{date}is[validdate]]" emptyMessage="Invalid date"
- Then the valid date(s) can be used to test for the existence or list
tiddlers.
- One could even use a generated list of valid dates to do relative
dates such as +45 days later using the set widget index parameter
The inability to format a variable as a date is still a restriction
Regards
Tony
On Wednesday, March 4, 2020 at 10:25:11 AM UTC+11, TonyM wrote:
>
> Folks,
>
> In this thread
> <https://groups.google.com/forum/?hl=en#!topic/tiddlywiki/kNJFU8w9Q_I>
> David asks how to generate a range of dates.
>
> This made me ask myself what if we had an operator that given a date input
> of the standard TiddlyWiki form YYYYMMDD+
> it was able to filter out invalid dates according to calendar rules
>
> That is if 20200229 or 20200229231215828 is filtered eg "is[validdate]"
> it would be passed through as there is a 29th of february this year.
> That is if 20210229 or 20210229231215828 would not be because there is no
> leap year in 2021
>
> This may be a simple javascript date function already available in
> tiddlywiki.
>
> It would then become possible to do the following;
>
> <$list filter="[range[1,31]addprefix[202002]is[validdate]]">
>
> </$list>
> to generate a list of February 2020 valid days of the month
> *I have not complicated the above with the need to zero fill the range
> value*
>
> From this proposed filter it would be very easy to generate date ranges or
> test any YYYMMDD for validity
>
> This could as easily extend to time as well if required is[validtime]
> HHMMSS
>
> What do you think?
> Can someone help me make this so?
>
> Regards
> Tony
>
--
You received this message because you are subscribed to the Google Groups
"TiddlyWikiDev" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To view this discussion on the web visit
https://groups.google.com/d/msgid/tiddlywikidev/72cc6675-667d-49e6-8552-d98906e48e7a%40googlegroups.com.
