Is there a command line tool that will simply evaluate a cron expression and return a bool response if it is supposed to be running right now? I'm looking for something I can use as a utility in another bash script. Something like so:

run_script=$(/tools/evaluate-cron-expression "02 4 * * *")
if [ "$run_script" -eq "1" ] # etc etc

I know, I know, I could just setup a real cron job, but I'm playing with the idea of wrapping all of my scheduled scripts inside of another script.