First Ten Days Of The Month
Beginning Of The Month
noun
じょうじゅん
上旬 (じょうじゅん) First Ten Days Of The Month, Beginning Of The Month
中旬 (ちゅうじゅん) Middle Ten Days Of The Month, Middle Of The Month
下旬 (げじゅん) Last Ten Days Of The Month, End Of The Month
The top 上 third of the time within a month 旬 has the First Ten Days Of The Month 上旬