Drafts for date-time functions

[Regina Henschel <regina.henschel@libreoffice.org>]

Hi all,

as suggested in the meeting I sent you the current state of my work. It 
shows my proposed solution for the case, that we decide to use new 
functions for 'rounding before extracting'.

The idea of using a dot in the function name comes from Michael. I like 
that idea. It makes the function names good readable.

I have added a new pseudotype DateTimeParam. That makes it possible to 
give YEAR.ROUND a different behavior than YEAR, for example.

The proposal does not introduce a DATETIMEVALUE.ROUND function as 
suggested by Michael, but uses the VALUE function directly.

Comments are welcome.

Kind regards,
Regina

Attachment: Add new functions with beforehand round seconds .odt
Description: application/vnd.oasis.opendocument.text