Birth = {^1988/2/29} * Age in {^1989/3/01} is: 1 years 0 months 1 day * Age in {^1989/2/28} is ? * if age= 0 years 11 months and 30 days * and age 1 year is not possible ( the person it doesn't have birthday) * then the possible choice is only: * in {^1989/2/28} is : 1 years 0 months 0 daysresult: the only common sense is