Did you know that bad days don't just happen? The only time you have a bad day is when things don't go the way you planned them. A bad day simply is that reality hasn't met your expectations of what "should" have occurred.
The degree to which it is a bad day, ranging from merely difficult to complete disaster, depends on how much you were fixed on sticking with your plan - ie. how much you resist what is.
Life isn't good or bad, it isn't out to get you sometimes, it just is what it is. Life is constant change. Can you be fluid enough and adapt?
How flexible and fluid you are with what is happening will determine how much freedom you will experience. If you can cultivate an attitude of "how fascinating!" to everything that happens to you, life will become an absolute adventure and never ever "bad".
The end of bad days is all in your attitude. You can step out the door with a plan, but surrender it to an attitude of adventure: "OK! what is going to happen today? Bring it on! I'm ready. And if I'm not ready, I'll just be surprised".
Do this and you'll never have a bad day ever again. I promise you.