I need, every 2 month, to execute some rule component programmatically but I don't know how to do this.
If I use hook_cron I don't know how to check 'once every 2 month' condition.
I can check
'the 10th day of the month' + 'month number is even'
but if the cron is runned twice this day? I cannot send 2 identical emails to users..
How can I achieve this?