August is a month of celebration for Singapore.
Happy Birthday, Singapore!
Selamat Hari Lahir, Singapura!
As I am learning Japanese, I would like to wish Singapore a happy birthday in Japanese too:
(If you would like to use the Japanese phrase to wish your friend a happy birthday, you may use お誕生日おめでとうございます or お誕生日おめでとう depending on how close you are to him / her.)