How many days are there in Feb 2004 ?
There are several ways to get how many days there are in Feb 2004.
We can calculate whether 2004 is a leap year or not. Or, we can subtract March 1, 2004 with Feb 1, 2004 to get how many msec and then convert msec to days.
The simplest way is: get the date before March 1, 2004.
March 1, 2004 is Date.UTC(2004,2,1); So the day before it is Date.UTC(2004,2,0);
Do you know that the date: Jan -5, 2004 equals the date of Dec 26, 2003 ?
So, if some one ask me: what is the date 200 days after Christmas of 2004 ?
OK, it is Date.UTC(2004,11,25+200);