The "white day" in the poem is likely a symbol of hope or possibility. It is a day that is yet to come, a day that is still full of potential. The white day represents the speaker's belief that dreams are worth holding onto, even in the face of adversity.
The poem's final line, "But only God can make dream come true," suggests that the speaker believes in the power of faith. He believes that dreams can only come true if we have faith in them and work to make them happen.
The "white day" in the poem is a powerful symbol of hope and possibility. It is a reminder that we should never give up on our dreams, no matter how difficult they may seem.