Someone know how to cron a salesforce job every 3 months, on the 1st at 9am? any ideas?
You will need to schedule using cron expression, something like
apexScheduledJob j = new apexScheduledJob (); String sch = '0 0 9 1 1/3 ? *'; System.schedule('My Job', sch, j);
Use cronmaker to generate crons for any requirement.
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