If it were to get anymore complicated than this, an ON TIME event would be needed. But obviously that would hurt resources. Having something like...
ON *:TIME:year:month:week:day of the week:day number:hour:minute:second:commands
ON *:TIME:2003:8:35:WED:27:16:48:49:echo -s test
ON *:TIME:2003:8:35:WED:27:4AP:48:49:echo -s It's either 4am or 4pm
And ON *:GTIME: for the $gmt to be used instead.
