Cherry-pick #8346 to 6.x: Correctly parse rfc3339 timezone and Nanosecond#8433

Merged

ph merged 1 commit intoelastic:6.xfrom ph:backport_8346_6.x

Sep 25, 2018

+106-34

Commits on Sep 25, 2018

Correctly parse rfc3339 timezone and Nanosecond (elastic#8346 )
ph
committed