That's how KIndle works. I select a day and it's available from 12:01am to 11:59pm one day and it's set on Pacific Standard time. But I have to do it at least one day out, not same day.

But I tried sending a PDF via email. If you don't see it, it might have gone into your spam folder.

The Subject line is:

C. Devine Book - Critical Revelations in the Realm of Contemporary Spirituality