What is true for a date is also good for good days. Much of what we do is internal to ourselves; we are alone in our tasks and our thoughts and it's the interaction with others that provides a special sort of value.
Interactions with others don't always come naturally to everyone. I have said for years that I've never met a stranger; I can walk up to anyone and make a casual friend. I'm odd though. For some people, connections are more difficult and they need a way to open themselves up to others.
"Hello"
"Hello" is a great way to open a conversation, a connection. "Hello" is the first step into a larger journey with another person. "Hello" creates a super-casual relationship that can lead to a subtle uplifting of the day or a deep friendship. "Hello" can be magical.
Sharing who you are, sharing your time, making connections make todays good days. Start making small connections and see how your days become better.