I hope you have a wonderful day together. The sun will shine, and the birds shall sing. Your footsteps will draw the melody of - just kidding. I hope that you have a fantastically mediocre day. This way when tomorrow is super terrible (read: step in a pile of shit, get crapped on by a bird, wake up late, forget to turn in homework, take two midterms in a row...) you won't be entirely crushed. Not to mention, you won't be caught entirely off guard because the sun and the birds won't distract you. So may you have a joyously, regular day. No tilde necessary.