how to make a calendara to give in my holidays

[glda19]

Hi

I search any tip how to make a calendar where i can give in my holydays by a code for the day.
And where automaticly set the public holidys for belgium.
and i whant also do a bit of calculation.
and i need also automaticly set a red line after a block of 4 weeks. But the first week of the 1ste 4 weeks for the year don't start in the 1st week of the year.
When the redline is between week 51 and 52 of the year befor. Than week 52 of the year befor is the first week of the of the following year.
And when here are weeks that spread over 2 months only a line after the last week

I hope it was a bit clear what i want

 

[xwb]

Do you wish to make a calendar or modify the built in calendar in windows/outlook

 

[SaltyTheFrog]

With so many holiday possibilities, national or local, I've found it easier just to set one up specific to my needs.