Just to long to twitter : Function Get-Easter ($y){$a=(19*($y%19)+15)%30;$b=(2*($y%4)+4*($y%7)-$a+34)%7;$d=(($a+$b+114)%31)+1;$m=[math]::Floor(($a+$b+114)/31);([datetime]"$m/$d/$y").adddays(13)} can be used like this : PS > Get-Easter 2011 Sonntag, 24. April 2011 00:00:00 Enjoy, Greetings //o// Read the full text.