A secret, Tomorrow and A Lie

The Jinn laughed loudly, "that's great! Let's begin, Great Prince Consort!"

"So my first question is…...If you have me you want to share me but if you share me, you no longer have me! What am I?"

These words echoed in Aman's mind. A hundred thoughts a second were running in his mind. He thought of many answers and discarded many answers.

His eyes widened in realisation. A very appropriate answer came into his mind. He matched it with the riddle and almost yelled,

"A secret!!"

"It's a secret! If I have a secret, I want to share it. And if I share it it's no longer a secret!"

"Very well, Prince Consort! Your answer is right! But there are two more. Let's see if you can answer them!"

"Dear Prince, my second question is.... I am a very important day for everyone. Everyone waits for me and I am always supposed to come! But I never come! Who am I?"