Jeremy, thanks.  
It worked.  I cut and pasted this into a file, imported into TW5, and 
that's it.  I created a tiddler with a start field "20120101", and another 
tiddler with the following list:

<$list filter="[has[start]]">
<$view field="start" format="date"/>
</$list>

I have noticed, the date field is set to time in UTC.  When the field is 
set to "20120101", then <$view field="start" format="date"/> renders it as 
December 31, 2011.  Is there a way to interpret dates in local time?

Thanks.

-- 
Arkady

On Tuesday, October 29, 2013 1:57:05 AM UTC-7, Jeremy Ruston wrote:
>
> The tiddlerfields that are defined in the core are not full modules 
> because they are needed before the tiddler loading mechanism is fully 
> installed. That call to $tw.modules.define() directly defines the module 
> exports.
>
> For a normal module, you should use something like this:
>
> /*\
> title: $:/plugins/arkadygrudzinsky/startfield.js
> type: application/javascript
> module-type: tiddlerfield
>
> Implements the start field as a date
>
> \*/
> (function(){
>
> /*jslint node: true, browser: true */
> /*global $tw: false */
> "use strict";
>
> exports.name = "start";
> exports.parse = $tw.utils.parseDate;
> exports.stringify = $tw.utils.stringifyDate;
>
> })();
>
> Let me know how you get on,
>
> Best wishes
>
> Jeremy
>
>
>
> On Tue, Oct 29, 2013 at 1:19 AM, Arkady Grudzinsky 
> <[email protected]<javascript:>
> > wrote:
>
>> Jeremy,
>>
>>
>>
>>>>    - Are tiddler fields always treated as text or is it possible to 
>>>>    set a field type (e.g. date, integer, etc.).
>>>>    
>>>> Tiddler fields are strings by default, but can be typed through the use 
>>> of "tiddlerfield" modules. The core tiddlerfields are in boot.js:
>>>
>>> https://github.com/Jermolene/**TiddlyWiki5/blob/master/boot/**
>>> boot.js#L713<https://github.com/Jermolene/TiddlyWiki5/blob/master/boot/boot.js#L713>
>>>  
>>>
>> A newbie question.
>>
>> I was able to chage my custom "start" field type to "date" by adding this 
>> to boot.js:
>>
>> $tw.modules.define("$:/boot/modules/tiddlerfields/start","tiddlerfield",{ 
>>
>> name: "start", 
>> parse: $tw.utils.parseDate, 
>> stringify: $tw.utils.stringifyDate 
>> });
>>
>>
>>
>> After that I was able to use 
>>
>>
>> I guess, it's not a good idea to mess with boot.js.  So, I tried to 
>> create a tiddler called "$:/boot/modules/tiddlerfields/start" and set its 
>> type to "application/javascript", "module-type: tiddlerfield".  But I could 
>> not get it to register.  It seems, I'm missing how to get the .js tiddler 
>> code registered as a module.
>>
>> I also tried naming the tiddler "$:/core/modules/tiddlerfields/start" 
>> thinking that boot somehow loads all "$:/core/modules" tiddlers, but it did 
>> not work.  What am I missing?
>>
>> Thanks.
>>
>> -- 
>> Arkady
>>
>>
>> On Saturday, October 26, 2013 7:12:39 AM UTC-7, Jeremy Ruston wrote:
>>
>>> Hi Arkady
>>>
>>> Thanks for the encouragement, and the detailed feedback, much 
>>> appreciated.
>>>  
>>>
>>>> I'm currently using mGSD to manage my tasks.  Recently tried TW5.  I 
>>>> think, it's awesome.  Wanted to thank Jeremy for Tiddlywiki.  <$list> and 
>>>> <$checkbox> widgets available at TW5 are very handy to create task lists 
>>>> by 
>>>> project/context/contact.  The TW5 ability to manipulate and customize 
>>>> tiddler fields is a great addition.  I was able to create <$list> of tasks 
>>>> sorted by custom fields such as "start", "due", or "priority".  I also 
>>>> love 
>>>> the minimalism of the interface.
>>>>
>>>
>>> Great, I'm glad that the checkbox and list widgets are understandable.
>>>  
>>>
>>>> Couple of questions about TW5 features for which I could not find 
>>>> documentation.  I'm thinking of implementing recurring tasks in TW5.  I 
>>>> envision using tags "recurring" and "weekly"/"daily"/"monthly", etc. and 
>>>> use fields such as "start", "modified", etc.  So, my questions are:
>>>>
>>>>    - Is it possible to set <$list> filter to select tiddlers using 
>>>>    comparisons?  E.g. select tiddlers with "start" date before "now" to 
>>>> make 
>>>>    tasks appear on the list at certain date/time?  Perhaps, it's possible 
>>>> to 
>>>>    do it in a similar fashion as mGSD handles ticklers, but I thought, 
>>>> <$list> 
>>>>    widget might offer a much simpler way.   
>>>>
>>>> There's no comparison operators yet, but the plan is to have them as 
>>> filter operator modules. See the "has" operator as an example:
>>>
>>> https://github.com/Jermolene/**TiddlyWiki5/blob/master/core/**
>>> modules/filters/has.js<https://github.com/Jermolene/TiddlyWiki5/blob/master/core/modules/filters/has.js>
>>>
>>>>
>>>>    - Is it possible to set <$list> filter to select tiddlers with 
>>>>    tags/titles matching a regular expression?
>>>>    
>>>> Not at the moment, but it's a good idea. 
>>>
>>>>
>>>>    - Is it possible to have <$checkbox> widget do more than assign a 
>>>>    tag to a tiddler?  E.g. Can it increment the "start" date field by 7 
>>>> days?
>>>>    
>>>>
>>> Not yet. TW5 doesn't yet really have the general concept of programmable 
>>> actions, but something along those lines is going to be useful. For the 
>>> moment, I'd expect a GxD implementation to have it's own extended checkbox 
>>> widget.
>>>
>>>>
>>>>    - Are tiddler fields always treated as text or is it possible to 
>>>>    set a field type (e.g. date, integer, etc.).
>>>>    
>>>> Tiddler fields are strings by default, but can be typed through the use 
>>> of "tiddlerfield" modules. The core tiddlerfields are in boot.js:
>>>
>>> https://github.com/Jermolene/**TiddlyWiki5/blob/master/boot/**
>>> boot.js#L713<https://github.com/Jermolene/TiddlyWiki5/blob/master/boot/boot.js#L713>
>>>  
>>>
>>>>
>>>>    - Is it possible to create contextual tiddler templates?  E.g. 
>>>>    - when a tiddler is tagged as "project", the tiddler view would 
>>>>       automatically show lists of tasks or 
>>>>       - when a tiddler is tagged as "context", the tiddler view would 
>>>>       automatically show a list of tasks orgainzed differently, etc.
>>>>       (similar behavior as in mGSD, only I would expect a more 
>>>>       transparent and customizeable syntax with <$list> and <$view>.  In 
>>>> mGSD, 
>>>>       it's done through macros which are hard to find and difficult to 
>>>> customize.) 
>>>>    
>>>> You can almost do that in a basic form with the reveal widget. 
>>> Basically each type of view that you need would be a separate ViewTemplate 
>>> segment (i.e. a tiddler tagged $:/tags/ViewTemplate). You'd wrap it in a 
>>> reveal widget that would selectively display the template depending on the 
>>> tags on the current tiddler. The reveal widget doesn't yet allow for 
>>> testing tags, though.
>>>  
>>>
>>>>
>>>>    - Would be nice to have an easy way to create a tiddler with a 
>>>>    certain template (e.g. create buttons with custom functionality).  I 
>>>> have a 
>>>>    feeling that buttons are already implemented, but not documented.  Is 
>>>> it 
>>>>    true? 
>>>>
>>>> There is a button widget that's used for the new tiddler button:
>>>
>>> <$button message="tw-new-tiddler" class="btn-invisible">{{$:/**
>>> core/images/new-button}}</$**button>
>>>
>>> The plan is to extend the tw-new-tiddler message so that the title of a 
>>> template tiddler can be provided. 
>>>
>>>> Finally, I may be reinventing the wheel.  Is there a GTD implementation 
>>>> based on TW5?  Even if there is, I, probably, would want to customize a 
>>>> few 
>>>> things.  So, I still would like to know the answers.
>>>>
>>> No, there's no GTD implementations that I'm aware of.
>>>
>>> Do be aware that TW5 will undergo quite significant changes in the next 
>>> couple of days as I complete a round of refactoring that I've been doing. 
>>> With the new changes the generated HTML is much cleaner, and the individual 
>>> widgets have been rationalised and simplified:
>>>
>>> https://github.com/Jermolene/**TiddlyWiki5/pull/178<https://github.com/Jermolene/TiddlyWiki5/pull/178>
>>>  
>>>
>>>> Thanks again to all Tidlywiki developers.  It's an awesome tool for 
>>>> many things.  I have not seen so much functionality packed in ~600K of 
>>>> code.
>>>>
>>> Thank you, much appreciated. Eventually we'll minify the TW5 core by 
>>> default, which should reduce the footprint somewhat!
>>>
>>> Best wishes
>>>
>>> Jeremy
>>>  
>>>
>>>>
>>>>
>>>>  -- 
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>>>> .
>>>>
>>>
>>>
>>>
>>> -- 
>>> Jeremy Ruston
>>> mailto:[email protected]
>>>  
>>
>
>
> -- 
> Jeremy Ruston
> mailto:[email protected] <javascript:>
>  

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