Mistery ?

I am a number that’s used to keep track,
Of a calendar that’s never slack.
Four digits long, but there’s more to see,
When you take a closer look at me.

The sum of all my digit is eleven,
but only one of my numbers is even.
you make think I’m kind of rare,
in leap years the count it’s there.

Divisible by ten, you might have guessed,
But look again, for there’s a test.
Add up my digits, and what do you find?
A number that’s quite unique in kind.

So tell me now, what could I be?
Think it through, and you will see,
The answer lies in the numbers above,
A code that signifies time and love.

if you know the answer, send us an email to info@cascabelcompanies.com