"Ku gatsu" is a Japanese word and in English it means "September"
January ichi-gatsu 一月February ni-gatsu 二月March san-gatsu 三月April shi-gatsu 四月May go-gatsu 五月June roku-gatsu 六月July shichi-gatsu 七月August hachi-gatsu 八月September ku-gatsu 九月October juu-gatsu 十月November juuichi-gatsu 十一月December juuni-gatsu 十二月
"Go gatsu" is a Japanese word and in English it means "May"
"Roku gatsu" is a Japanese word and in English it means "June"
"Shichi gatsu" is a Japanese word and in English it means "July"
"Ichi gatsu" is a Japanese word and in English it means "January"
"Ni gatsu" is a Japanese word and in English it means "February"
"San gatsu" is a Japanese word and in English it means "March"
"Juu ichi gatsu" is a Japanese word and in English it means "November"
"Shi gatsu" is the Japanese word for the month of April. It consists of two kanji characters: "shi" meaning "four" and "gatsu" meaning "month." Together, they form the word for the fourth month of the year.
Nana-gatsu or shichi-gatsu
Watashi no tanjōbi wa sen ku-hyaku ku-jū nen, jū-gatsu, jū-san nichi desu 私の誕生日は1990年10月13日です
Without seeing the Kanji, I cannot definitively translate the 'ku' you are referring to. 'Ku' can mean several things, including 'nine,' 'ward,' 'section,' and 'pain.'