the first of JuneJune the first on June 1st.都可以讲，一般最后一个用的比较多，用了介词on，第一个一般用在句首。给你几个例句：1.Children' s Day is always the first of
June.2.June
the first is International Children's Day.3.Children's Day in China is on June Ist.都表示六月一日是儿童节的意思希望对你有帮助。