Hello,

below you can see a table devided in months and weeks.
In every week there can occur an event, here called "A".

Question:
How can I count in how many months an event happens.
Result for table below is 2, in Jan and in Mar.

Jan Jan Jan Jan Feb Feb Feb Feb Mar Mar Mar Mar
wk1 wk2 wk3 wk4 wk5 wk6 wk7 wk8 wk9 wk10 wk11 wk12
A A A A

Thanks for your support.

Regards
Werner