transform to nanoseconds (numpy will truncate doubles when converting to datetime64)
transform to nanoseconds (numpy will truncate doubles when converting to datetime64)

terrytangyuan/reticulate,rstudio/reticulate,rstudio/reticulate,rstudio/reticulate,rstudio/reticulate,terrytangyuan/reticulate,rstudio/reticulate,terrytangyuan/reticulate