[R] working with zoo time index ??

[skan]

Hi
I'll ask in a different way...

I have all this in a file.txt

1990-01-01 10:00:00 ,  0.900          #  element 1
1990-01-01 10:01:00 ,  0.910          #  element 2
1990-01-01 10:03:00 ,  0.905          #  element 3
1990-01-01 10:04:00 ,  0.905          #  element 4
1990-01-01 10:05:00 ,  0.890          #  element 5
..................................................................
2000-12-30 20:00:00 ,  11.233        # element 3323232

How do I loop through the index? first element 1, then element 2, then the
third...
How do I extract the day or the hour or the minutes from an element from the
index(element n)?
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