my little brother has run up an average hours thingy based on the 17 week cycle if i get the nod from the mods it will be available on here as a free download all you do is type in weeks hours and it calculates your average…yes you can use a calculator but this thing will sit on the desktop as a shortcut 
go on put it up the mods will remove if not suitable
It can be over 26 weeks.
Can it handle rolling periods as well as fixed?
Stick it up.
I was thinking about doing something myself in VB where each day you input your working hours/minutes, and it adds up what you have done in any period and would keep a record of it for two years.
Still thinking about it.
Anyone else on here versed in Visual Basic?
just looked at the thingy it appears to have a place to alter the number of weeks
Where is it then??