StartBoundary is a property on all triggers and can be set upon trigger creation. For example, if you wanted to create task that executes every day from this point forward at 2:00 a.m. and 2:00 p.m., you could do the following:
td.Triggers.Add(new DailyTrigger() { StartBoundary = DateTime.Today.AddHours(2) }); td.Triggers.Add(new DailyTrigger() { StartBoundary = DateTime.Today.AddHours(14) });