Hi Derek,I'm in sunny Brisbane too and have encountered the same problem and recently created a github issue for this problem here.It is a little confused with AEST containing cities which have daylight savings (Melbourne) and cities which don't (Brisbane). It is unlikely you have any misconfiguration for ubuntu, mysql, or osticket however which is something at least.I've worked around the problem by making the code simply return "Australia/Brisbane" always. This is fine is your server and code is always in Brisbane which it very likely is. I've made a branch on my Github you can check this out here and pull from that branch to apply to your copy of the osticket code. Since making the issue I've thought about a fix a little more and the best idea I have currently is to make a PR which first checks to see if the database has an explicit timezone set rather than "SYSTEM", and if so, use that. This will mean a little extra work for us in configuring our database however it is a little nicer than just hard setting the timezone like in my branch above.Just let me know if you would like any further details on the problem or on applying my branch to fix this if you want.Perry