@darkdevil so vielleicht
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in der Funktion dann das
var date = new Date();
var currentThursday = new Date(date.getTime() +(3-((date.getDay()+6) % 7)) * 86400000);
var yearOfThursday = currentThursday.getFullYear();
var firstThursday = new Date(new Date(yearOfThursday,0,4).getTime() +(3-((new Date(yearOfThursday,0,4).getDay()+6) % 7)) * 86400000);
var weekNumber = Math.floor(1 + 0.5 + (currentThursday.getTime() - firstThursday.getTime()) / 86400000/7);
return (weekNumber);
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