In Harry Potter and the Philosopher's Stone, Voldemort is happy to see Harry dead and in the chapter The Man With Two Faces he orders Quirrell multiple times to kill Harry.
And Quirrell, though pinning Harry to the ground with his knees, let go of his neck and stared, bewildered, at his own palms – Harry could see they looked burnt, raw, red and shiny.
‘Then kill him, fool, and be done!’ screeched Voldemort.
Quirrell raised his hand to perform a deadly curse, but Harry, by instinct, reached up and grabbed Quirrell’s face –
[Harry] could only hear Quirrell’s terrible shrieks and Voldemort’s yells of ‘KILL HIM! KILL HIM!’
Philosopher's Stone - pages 213-214 - Bloomsbury - chapter 17, The Man With Two Faces
In Harry Potter and the Chamber of Secrets, Tom Riddle is determined to have the Basilisk kill Harry.
Yet by Harry Potter and the Goblet of Fire, Voldemort is sure hell bent on using Harry's blood as part of his resurrection potion (GoF - Bloomsbury - chapter 32, Flesh, Blood and Bone).
When did Voldemort realize that the protective enchantments in Harry's blood would benefit him (Voldemort) by adding it to the resurrection potion?