What makes a day a "good day" or a "bad day"? Simple, it is based on how the day unfolds compared to our expectations. If the day goes better than expected or as expected, it is a "good day". When the day takes a turn and does not meet our expectations, it is a bad day. So in short, we feel good or bad based on a "guess" on what our day should look like. And usually, the guess involves activities and outcomes that revolve around our own well being, happiness and self-interests.
Lord, help me to look at my day as being Your day and as an opportunity to experience variety and to worship you.