What Are the Ides?
In the ancient Roman calendar, each of the 12 months of the year had an "ides." In March, May, July and October, the "ides" fell on the 15th day. In every other month, the "ides" fell on the 13th. The word "ides" was derived from the Latin "to divide." The "ides" were originally meant to mark the full moon - but since the solar calendar months and lunar months were of different lengths, the "ides" quickly lost their original intent and purpose.
So an alternative (albeit somewhat dubious) theory, as to why Caesar might have "seemingly" ignored the ominous warning of Spurinna, is that perhaps Julius Caesar got the dates of the warning mixed up. He may have been thinking that the Ides of March fell on the 13th.

Using this theory, forgetful Caesar would have been very careful and stayed home on the 13th of March, but on the 15th of March his guard was down.

Today I Die
I Know Now I Must Say Goodbye
There Is A Saying
"I Don't Want Someone,
That Does Not Want Me"
I Will Cherish The Memory
I Will Throw Away The Pain
Then Start ALL Over Again
In A Land Where
There Is No Rain
Peace To The Dove
Wishing Away Love
If We Ever Do Meet Again
It Will Be From Above......

My Poem To My Lost Soul and Angel...Peace and Happiness in your pursuit, Always.......