This has been driving me batty and makes me hope there is a simple solution 
I'm missing.

I have a button which is supposed to create a new tiddler named "Dream Log 
YYYY-MM-DD" tagged with the current tiddler.

It looks like this and NEARLY works:

\define dream-log-button()
<$button>New Dream Log
<$action-sendmessage $message="tm-new-tiddler" title=<<now "Dream Log 
YYYY-0MM-0DD">> tags="[[$(currentTiddler)$]]">
</$button>
\end

<<dream-log-button>>

The only problem is, if you click the button after noon, it creates a 
tiddler titled "Drepm Log 2020-05-26" because "am" is significant to the 
"now" macro.

I've been going in circles trying to figure out how to concatenate the 
string "Dream Log " to the result of the macro call <<now "YYYY-0MM-0DD">> 
and feed that into the "title" attribute of the action-sendmessage.  But 
I'm not quite getting it.  I figure I must be missing something simple, 
since this seems like a simple thing.

I've tried this:

\define dream-log-title()
Dream Log <<now "YYYY-0MM-0DD">>
\end
\define dream-log-button()
<$button>New Dream Log
<$action-sendmessage $message="tm-new-tiddler" title=<<dream-log-title>> 
tags="[[$(currentTiddler)$]]">
</$button>
\end


but that just gives me a tiddler named "Dream Log <<now "YYYY-0MM-0DD">>"

I've been banging around switching <<>> for <$macrocall>s, creating 
variables and trying to interpolate them into macros, and so on, but so far 
haven't got it right.

Can somebody point me in the right direction?

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