Is the last May of the lunar calendar May or June?

Generally speaking, the lunar calendar is based on twenty-four solar terms. For example, fortune-telling begins with eight characters, marriage talks about the moon, new houses are put into fire, and burial is based on the twenty-four solar terms!

16: 46 on June 6, 990 to July 7, 0990 17: 00, belonging to the fifth month of the lunar calendar.

1July 7, 990 17: 00, 1: 00 to1August 8, 990 at 5: 38, belonging to the sixth lunar month.