六月一日用英语怎么说?

the first of June
June 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