eitsupi commented on issue #40109:
URL: https://github.com/apache/arrow/issues/40109#issuecomment-2439259789
> The default should be to convert to nanoseconds, like
`arrow::as_arrow_array(type = arrow::duration("ns"))`. 2^64 ns is ~585 years,
so you don't generally have to worry about overflow.
In fact, since the difftime class object is based on a double vector, isn't
the period that can be represented exactly up to 2^53-1 as described here?
https://github.com/apache/arrow/issues/32693#issuecomment-1846140077
I have recently rewritten the polars package and have restricted POSIXct and
difftime resolution to millisecond to support more than sufficient range.
https://github.com/pola-rs/r-polars/blob/1f7cd37637a98f2c6a6f88ed27c608118ffaf939/R/as_polars_series.R#L28-L37
If we need full nanosecond resolution, I think we will need to use the
`clock` package.
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