I think it's anticipatory: Today is my birthday.
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In your sentence "it" is called "prop-it" or "dummy-it". It has no meaning whatsoever. It's used only to comply with the prnnciple that finite verbs in English must always have a subject.
Besides, anticipatory subject "it" does not anticipate noun phrases. It only anticipates a real subject with the following categories:
- noun clause: It is true that she did it
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