ian.fickling (9/6/2010)
...As Cliff Corder mentioned earlier the diggest difficulty with 445/444 is that you end up with 364 days a year. Each year your calendar drifts a day eventually after 7 years what was week1 does not match a like for like date of week1 the previous year.
...
When week1 2010 is compared to week1 of 2009, one is not comparing like for like dates.
This causes lots of complications in which we had to introduce a new 'compare to' type columns.
I was wondering how other people have coped with this issue.
I use a 60-week year (each month has 5 weeks). For comparison purposes, each week has a 'last year' value, and does a pro-rata between years where a month switches from 4 to 5 or 5 to 4 week months. e.g. The ratios for 4-to-5 are this[1]= last[1], this[2]= last[1]*0.25+last[2]*0.75, this[3] = last[2]*0.5 + last[3]*0.5, this[4] = last[3]*0.75 + last[4]*0.25, this[5]=last[4]
hope that helps
Brewmanz