How can I change XTS to data.frame and keep Index?

Question

I have an XTS timeseries in R of the following format and am trying to do some processing, subsetting and re-arranging before exporting as a CSV for work in another program.

Answer 1

Since 1.9.6 You can convert directly from/to xts without losing index class. As simple as:

as.data.table(master_1)

The index is added as the first column in the result data.table, it retains index Date or POSIXct classes.