tmux conf: run bash command and store in variable

Question

I would like to set date +"%m %d %y" to a variable in my tmux.conf file to set it to set-option -g set-titles-string. How can I store the value of the output of the shell command in tmux.conf and dereference it later?

Answer 1

I needed to do something similar, and was able to figure out how. Using what OP wanted as an example, it'd be something like:

curr_date='#(date +"%m %d %y")'
set-option -g set-titles-string $curr_date