[Rcpp-devel] Problem with Rcpp::Datetime

[Dominick Samperi]

In the process of migrating from the classic API I have
found what appears to be a problem with Rcpp::Datetime.
There is no unit test for this situation.

Rcpp::Datetime dt("2015-04-15 06:00:00")
and
Rcpp::Datetime dt("2015-04-15 06:00:00.0")
both fail due to a type conversion error.

Here is the original constructor:
Datetime::Datetime(const std::string &s, const std::string &fmt) {
        Rcpp::Function strptime("strptime");    // we cheat and call
strptime() from R
        m_dt = Rcpp::as<double>(strptime(s, fmt));
        update_tm();
}

The problem is that strptime() returns POSIXlt type, not POSIXct type.
Adding Rcpp::Function asPOSIXct("as.POSIXct") and using it
to convert seems to fix the problem.

Dominick
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