Just for today, decide to be happy. To live with what is yours. If you can't have what you want maybe you can like what you have.
Just for today, decide to be kind, cheerful, understanding and be your best. Dress your best. Talk softly. Look for the brighter side of things. Praise people instead of criticizing them. Just for today, try it.
After all, it's just for a day.
Who knows?
You might like it and do it again tomorrow.