ジュン、シュン

旬, 勹, 丿, 日

decameron, 10day period, season (for specific products

下旬(げじゅん): month (last third of)
中旬(ちゅうじゅん): middle of a month; second third of a month
上旬(じょうじゅん): first 10 days of month
初旬(しょじゅん): first 10 days of the month