tree e2063d3ad60bc16b870a329483c1255e7349fb20
parent 3ebd81750479f745e97fe382daaeecd7e3a81187
author Jeff Genovy <29107334+jefgen@users.noreply.github.com> 1550718191 -0800
committer Jeff Genovy <29107334+jefgen@users.noreply.github.com> 1550774940 -0800

ICU-13820 ICU4C should use "Etc/Unknown" zone when host TZ detection fails.
Update API docs comments to clarify what is returned in failure cases.