My birthday at the Army day.

我的生日在建军节。

The first day of August is Army day.

八月的第一天是建军节。

Aug. 1 of every year is our Army Day.

每年的八月一日是我们的建军节。

August 1st is Army Day.

八月一号是建军节。

August The first day of August is Army day.

八月的第一天是建军节。