date_range export to csv weird behavior
Hello,

Working with 0.8.1

date_range works nicely, I am using the technique to reduce sparse GPS measurements to a fixed time step.

procedure:
step 1: create date_range ("10S"), all datetime within a single day (input from gpx)
step 2: outer join with original data
step 3: interpolate the locations

Everything works fine, .to_string() results in results as expected. 

When I export the result to_csv(), the date_range object is exported with the correct datetime, but the date part is reduced to to january 1970. How is this possible?

Can somebody get me on the road again?

Luc
