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Re:Crontab.guru – cron schedule expression editor by ganeshkrishnan on Thursday October 03, 2019 @04:25PM (#21151762)
Note that for Java/Spring cron there is an extra field for "Seconds" so it has one extra field to be configured.
Re:Crontab.guru – cron schedule expression editor by psilocipher on Friday October 04, 2019 @05:07AM (#21155999)
Java Spring documentation also claims to support the question mark vs. asterisk character, however it seems that some versions treat them identically, where the ? is supposed to be a random value and the asterisk is supposed to mean every value...

https://stackoverflow.com/questions/30341067/difference-betw...

Re:Crontab.guru – cron schedule expression editor by encoderer on Thursday October 03, 2019 @08:22PM (#21153700)
This is true, and some others support “years”.

I hope to add this feature soon.