I am trying to add a cron trigger "1st june every 2 years". Looked all over the Internet and still can't figure out "every 2 years". thanks very much !
How about 0 0 12 1 6 ? /2
Take a look at Cron expression that runs for every 2 years - Stack Overflow
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The third digit refers to the day of the month - in your expression you have “0” which clearly is incorrect. Did you try the string I gave? Although, since I’m not at my Mac I’m not able to try it myself!
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I am very sorry @tiffle to test your patience. It still does not work.
Annotations
1- is a snapshot of your post
2 and 3- my entry and the error message
thanks again
No problem - as I said I’m not at my Mac so I’m just guessing.
0 0 1 6 * 2023/2
which maps to;
- Minute: 0
- Hour: 0
- Day of month: 1
- Month: 6
- Day of week: * (that’s any)
- Year: 2023/2 (every other year starting 2023)
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Good question. I don't know how to plug this into a KM Cron trigger, because it's out of range, but this is the cron format that works in the CronMaker site that was within the site @tiffle posted:
0 0 0 1 6 ? 2023/2
At 12:00 AM, on day 1 of the month, only in June, every 2 years, 2023 through 9999
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That's what I said in my post.
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yes, you are right. My comment was superfluous. Sorry
The format works on cron checkers but maybe it's boiled down to the cron implementation that's programmed within Keyboard Maestro. I don't know if there is such a thing. You would have to ask @peternlewis. I remember trying cron examples, years ago, and some formats didn't work within KM or I just didn't know enough to put it in a format that KM could use.
You missed my suggestion in post no. 6
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The KM wiki says “You can also add / and a number after a range to match every N'th value“ so maybe you have to use:
2023-2099/2
to achieve what you’re after? In other words every 2nd year in the range 2023 to 2099.
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Nope - after guessing a bit I decided to read the KM wiki page 
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Ooooooooo!!!! That's how it's done! Good catch @tiffle!!!! That's happiness right there.
The Keyboard Maestro Wiki has the nuggets. Just have to read them.
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Classic example of all of us learning together. Wonderful stuff.
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Now back to Glastonbury 
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You have a solution, and a good one at that, but I just want to point out that sometimes folks try too hard to find the perfect solution when there is a trivially good solution available.
In this case, just trigger every year and check that the YEAR() is odd (or even) and only do something if it is. It's not like you care whether Keyboard Maestro wastes a few microseconds of CPU every other years…
Also note that the trigger will only run if the Mac is awake at the time the trigger would fire.
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