Hmm.. I don't get it.
I have set alert time correctly (or I think) and server time comes from NTP server.
Well, I have few original alerts that comes with SolarWinds NPM and they seem to work. I haven't tried with custom made simple alert. Because I wan't to get alert when one member (node) in group goes down or puts some kind of alarm.
Could you send me some pictures maybe how did you diagnosed it? In few days I will get SMS-gateway connected to server and maybe test with that.