Hey @wjone!
Yes you can!
Timers can include JavaScript code, we can use that to evaluate the time and only have an output if it’s 30 minutes past an hour.
First set your timer’s interval to 30 minutes, then here’s the code, replace the YOUR_MESSAGE
field:
$(eval t=parseInt('$(time Etc/UTC "m")'); if(t>=30){'YOUR_MESSAGE'})