Please download the latest version, it addresses issues with 12am/pm, and adds the keywords "noon" and "midnight" ("tomorrow" should work already).
Specifically, if you type "am" or "pm" with a time it should use the time as entered, otherwise it will assume a 24-hour clock if you use hh:mm or hh.mm, falling back to a time based on the current time if you just put e.g. "r at 6 to do something". Hopefully this is a little more intuitive now.