"noyau" wrote
That is first step. Thnx a lot.

You're welcome. Glad it helped.

Now the point is to do the same thing for a
daily variable next to the date.
The problem is that the second variable is
not increasing or decreasing.
Still working but no result.

Suggest you put the above in as a new posting, elaborating carefully how the
2nd "variable" in B1 is supposed to vary within the corresponding range in
B3:B33, in relation to the dates in A3:A33. As it stands here, based on
what's posted I've no guesses on the pattern.
--
Max
Singapore
http://savefile.com/projects/236895
xdemechanik
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