Available hours for Machine Type- Resource

 Hi,

For developing one report we need to calculate total available hours for Resource type- Machine.

Consider one resource is available for two shifts of 8 Hours each, then total available hours for the day will be 16 Hours.

But the problem I am facing is if I change shifts for this resource say Today and If I want to capture available hours for last month then from where I can capture this information?

Because in masters the available hours information will be updated & there will not be any past data.

Thanks,

Swapnil