Help with dates/if function

I have a colum with: Years and N/A's. Want to put a formula to the right which says IF: column to left is a date, say "Yes" if not, say "No." I tried if XX>0 but apparently N/A reads as a number larger than 0?

Have you tried this?

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It's the reverse order of what you asked but gives the result you want.
Change A1 to the cell that has the date or N/A in it.

Try

Formula:

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Is your date an actual date, and not a text entry that looks like a date? Test with =isnumber(a1) FALSE indicates text