Question

How to calculate the number of difference between a specific date to the current year last date.
Consider I would like to show date difference between 2009-09-01 to current year last date(2010-12-31)

Answer 1

Use to_days:

select to_days(concat(year(now()),'-12-31')) - to_days(now()) as days_left;
+-----------+
| days_left |
+-----------+
|       121 |
+-----------+

or use datediff like this

select datediff(concat(year(now()),'-12-31'), now()) as days_left;
+-----------+
| days_left |
+-----------+
|       121 |
+-----------+