Firstly, don't cross-post.
Second, take a look at the archives on both these lists for answers to
your questions.
'its' is rather old, and not where you want to be looking.
Take a look at xts for fast time-series manipulation like you need,
specifically to.period, endpoints, and align.time.
You probably want to ask the author of the its package directly about that.
Note that as.zoo has an its method and as.its has a zoo method and
they will allow you to convert back and forth between its and zoo so
you can effectively use the functionality of both packages:
# converting back and
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