[fmorel]

But can you trust that the expression it generated is accurate and it's not lying to you?

I'd rather use something like https://crontab.guru/ to verify my syntax, thus I have it bookmarked for the 1-2 times a year it comes up.

[galkk]

As I said - it gives me very good initial approximation, so I can go to docs with an example that I'm trying to figure.