When do Choerospondias axillaris fruits generally ripen each year?

I discovered a problem: the sour jujubes I ate as a child were never ripe, so sour they'd make your teeth fall out. The sour jujubes I ate as a child were all green. Ripe sour jujubes are not that color. Let's see when Choerospondias axillaris ripens.

Choerospondias axillaris fruits ripen from September to October. When the fruit skin turns from green to yellow, knock the fruits down or pick them up after they fall naturally, pile them up to rot, rub and wash off the flesh, then dry them and store them mixed with sand.

Sour jujube, also known as four-eyed fruit, Hualang fruit, and snot fruit, is the sour jujube tree, a plant in the Anacardiaceae family. It is distributed in Zhejiang, Fujian, Hubei, Hunan, Guangdong, Guangxi, Yunnan, Guizhou and other places. The pit of Choerospondias axillaris is relatively large and very hard. Because it has five eyes at its top, it has symbolized “five blessings arrive at the door” since ancient times. The drupe is elliptical or obovate, yellow when ripe, with a fleshy, pulpy mesocarp. The flowering period is April, and the fruiting period is August-October.