No. You cannot just use your birthdate as a copyright stamp. The copyright stamp is issued only upon publication of something. For example, many of my poems were composed by me many years before I ever published them. Those poems did not carry any form of copyright while they were just sitting in my journals because they had not been published. Anyone could have stolen my journals and published those poems under their own names and it would have been impossible for me to even make a case for plagiarism.

In fact, back in the 1980s, someone stole several dozen of my fashion designs from my sketch journals and sold the designs as their own. I could do nothing at all about it.

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