Feb,4th,2004(这里按英国习惯；美国习惯是：4th,Feb,2004)
Dear Jones,
How is everything going these dayes?
Our little John's birthday is coming.So if you have got any free time on next Friday evening,we are very happy to invite your family to attend his birthday dinner party at Holiday Inn.The party will begin at 6:30.
Best wishes!
John