The day that the software is complete is the day the software is complete. Being angry, happy, or indifferent will not change that date. At all. There will always be bugs to be angry with. There will always be progress to be happy with. But the software will be done on the day it is done, regardless of what your mood along the way is. You are powerless to affect it. The only thing you have the ability to change is your attitude along the journey. Nothing else.