Issue started to happen after upgrading to stable version "2017 Week 2"
This is reported by our Israel team, they sometimes got the following prompt:
When that happens, they check their phabricator timezone setting, and found out that Asia/Jerusalem listed under UTC-0 (should be UTC+2 instead)
This is not consistent, they mentioned the error would pop up occasionally, when it pops up, Asia/Jerusalem is listed under UTC-0; and when it's not, it's correctly under UTC+2.
Not sure if this is a new bug in phabricator code, or something wrong with my server side setting, but the issue starts to happen after upgrade.