Answer:
I keep things green and keep kids happy during summer time.
You can read me both ways I wear; One way it's a number reversed a snare.
I'm where yesterday follows today and tomorrow is in the middle. What am I?
What do you call a fish with no eye?
Until I am measured, I am not known. Yet, how you miss me when I have flown. What Am I?
Who makes it, has no need of it. Who buys it, has no use for it. Who uses it, can't see it. What is it?