Inventory Reports- up to date total value AND End of the day cost changes -/+

I need two custom reports set up and I am not sure how to do that. I mean, I know how to customize a report but nothing I have tried seems to give me the result I am looking for so, I need help. 1) I need a report that actually shows our inventories total value by months. The valuation report is very close to what I need but it doesn't give past information and I need to be able to go back months or years by the month and run reports. And 2), I need a report that will run at the end of everyday with any inventory cost changes +/- so we can be up to date on our pricing. 

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