Ability to schedule an email to go out at a particular TIME of day

When I go to a guest booking, and then to messages, and then to scheduled messages, I can schedule a message to go on a particular DATE, but I want to also specify the TIME. (Eg I don't want it to go at 1am on the date, as that would be weird. I want to send it at, eg 8am. Similar to the way you can set triggers to a specific hour.)

out of pure curiosity: if you are talking about triggers, this is already possible (see screenshot) so I'm going to assume you are talking about something else.

I have multiple triggers like this one, set for a specific time

Hi! No I’m not talking about triggers. I use those. I’m talking about queuing up an email to go out tomorrow at a certain time. So more of an ad hoc basis.  I want to send one guest a message at 10am tomorrow. For example. 

Ah, i figured is something like that. I really want that feature too.

Here's my scenario (this happens quite often to me): guest asks me for early check-in, and they send the question,m most of the time, day before the check-in date. My normal check-in time is 4:00 PM and the guest wants to check in at 1:00 PM (example). I have a trigger set for 4:00 PM that sends the guest the access codes. initially, this trigger was set for morning on the day of check-in until a guest got in early without telling me and our housekeeper walk in on them, so I change the trigger for 4:00 PM

IF we are able to do early check-in, at the moment, I have to manually go and trigger sending of codes at the right time. what I would love is to be able to change the trigger time, for a specific booking. 

Does this sound similar to what you want? not talking about you wanting to send the access codes, more like wanting to change a schedule trigger time for a specific booking. 

The other scenario, which is probably closer to want you want, is to create a message without using triggers that is one-off to be sent to a guest on a specific booking and for you to have the ability to specify when (date and time) the message is sent