Hi Bruno I also have the problem med week-number and maked a copy of your expression. But I ha' still a problem. Can you see what my problem is?? 'Cosmic Kontakt start' is my 'startdate' Format(TreatAs(_Number_, Trunc(( ( ( TreatAs(_Number_, ('Cosmic Kontakt start') - TreatAs(_Number_, DateFromMDY(1, 3, Year(TreatAs('Cosmic Kontakt start', ( ( TreatAs(_Number_, 'Cosmic Kontakt start') - DayOfWeek(TreatAs('Cosmic Kontakt start', ( TreatAs(_Number_, 'Cosmic Kontakt start') - 1 ))) ) + 4 ))))) ) + DayOfWeek(DateFromMDY(1, 3, Year(TreatAs('Cosmic Kontakt start', ( ( TreatAs(_Number_, 'Cosmic Kontakt start') - DayOfWeek(TreatAs('Cosmic Kontakt start', ( TreatAs(_Number_, 'Cosmic Kontakt start') - 1 ))) ) + 4 ))))) + 5 ) / 7 ))), 'Z2.0')
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