New draft for Obscore time extension

[Mireille LOUYS]

https://github.com/ivoa-std/ObscoreTimeExtension

Dear DM , dear Time domain members,
you will find here a new draft for Obscore Time extension.
but I attach below the pdf for quick reading.

This is a preliminary version which will be commented next week at the 
Interop meeting.

your comments, questions and contributions are welcome .

many thanks , Mireille

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Mireille Louys,  MCF (Associate Professor)
Centre de données CDS		Images, Laboratoire ICube &
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