Moving to ISO Dates
I would suggests as, when not using the lagacy TWiki date format (DD Mmm YYYY), we use
only the standard ISO date format: YYYY-MM-DD
See:
http://www.w3.org/TR/NOTE-datetime
The reason is that this format is unmistakable, compared to the / form that you can find as YYYY/DD/MM or YYY/MM/DD. It is also alphabetically sortable.
Optionally, one could use the ISO time format also:
YYYY-MM-DDThh:mm:ssTZD.
Alas, it is not very readable

Something like
YYYY-MM-DD.hh:mm:ss would have been better...
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ColasNahaboo - 06 Jan 2005
See
UseIsoDates
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PeterThoeny - 31 Mar 2007