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https://issues.apache.org/jira/browse/TAPESTRY-2198?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12587448#action_12587448
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Geoff Callender commented on TAPESTRY-2198:
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I think that for T5.0 to go final it must, at least, support the "format" 
attribute.  Most of the world does not use USA-style formatting, so it's 
essential that all standard components take this into account if T5.0 wants to 
be taken seriously.  Otherwise T5.0 runs the risk of being labelled "immature" 
and people will turn their backs on it.


> Date formating global support
> -----------------------------
>
>                 Key: TAPESTRY-2198
>                 URL: https://issues.apache.org/jira/browse/TAPESTRY-2198
>             Project: Tapestry
>          Issue Type: Improvement
>    Affects Versions: 5.0.11
>            Reporter: Davor Hrg
>
> there is a javascript implementation of
> SimpleDateFormat and is apache 2.0 licensed
> http://www.timdown.co.uk/code/simpledateformat.php
> it implements most of:
> http://java.sun.com/j2se/1.5.0/docs/api/java/text/SimpleDateFormat.html
> It is 8.7 Kb with stripped comments.
> I'm looking at making a trimmed down version that can parse/format only 
> numeric date parts : day, month, year, dour, min sec.
> This covers most likely usages on the client side (forms and datefield) and 
> would make shorter code. 
> (I feel that prototype is bloated already so another 10K does not look 
> apealing)
> Not to complicate things and optimize too soon, full lib can be used now,
> and later along with "multiple js lib support" the short version should be 
> made available and pushed as default.
> while talking about dates... date format should be in message catalog so it 
> is locale specific.
> for example in my language date format is: dd.MM.yyyy
> there should be different keys for server side format and client side format
> (the formats should be compatible of course)
> tapestry-date-format-server=MM/dd/yyyy
> tapestry-date-format-js=MM/dd/yyyy
> (which are sam in case we use forementioned lib)
> or, if one would choose to use the former date picker i would be:
> tapestry-date-format-server=MM/dd/yyyy
> tapestry-date-format-js=%m.%d.%Y
> I feel strongly about this being global  key instead parameter for
> datefield, but even if it is only for date-field there should be two formats 
> (server and js)
> in the end... the formater should be used to test validity for the field on 
> the client side
> or regexp added to message catalog
> tapestry-date-format-js-regex=...complex or simple regex......

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