* added timezone override information.

* added usp.

* added some code comments.

* added more documentation of the date and time functionality.

* Update docs/sources/reference/timerange.md

Co-authored-by: Diana Payton <52059945+oddlittlebird@users.noreply.github.com>

* some small adjustments.

* fixed comments according to feedback.

* Update packages/grafana-data/src/datetime/parser.ts

* Update packages/grafana-data/src/datetime/parser.ts

* Update packages/grafana-data/src/datetime/parser.ts

* fixed final feedback.

Co-authored-by: Diana Payton <52059945+oddlittlebird@users.noreply.github.com>