Reading a timeline

05AB1E, 19 18 bytes

Code:

ð¢>UágF²N>.bkX-¹+,

Explanation:

ð¢                   # Count the number of spaces before the year starts
  >                  # Increment by 1
   U                 # Pop and store this into X
    á                # Keep the alphabetic characters of the second input
     g               # Take the length
      F              # For N in range(0, length), do...
       ²             #   Take the second input
        N>           #   Push N and increment by 1
          .b         #   Converts 1 to A, 2 to B, etc.
            k        #   Find the index of that letter in the second input
             X       #   Push X
              -      #   index - X
               ¹     #   Get the first input, which contains the year
                +    #   Add to the difference of the index
                 ,   #   Pop and output the sum

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Uses CP-1252 encoding.