Every day is important to someone.
On the most basic level, every day sees lots of people being born, passing away, obviously that day is vitally important to them, either way.
But every day sees love blossom for the first time, as true love begins to take a hold between people.
And every day sees love die for the last time, as true love turns out to be false, or at least true no more.
The world spins on birth, death, love, hate. Every day is important to someone.
But some are more important to people generally, I grant you.