The plus and minus signs (+/-) are not intuitive. For example,
"Etc/GMT-10" actually refers to the timezone "(GMT+10:00)
Canberra,Sydney,Melbourne".
[red. that is not fully true, as it is *just* GMT+10. This setting does not take care of daylight savings time for example. Please avoid using them.]
"Etc/GMT+10" actually refers to the timezone GMT-10:00.
These are what I have tested. I believe other + and - are also logically reversed.
