TragicGlee's board-to-board with Nabu

Josuke accidentally kills a patient in Chapter 86, 6 days before the harvest. In Chapter 89, Norisuke's newspaper states that the incident occurred on the 19th. That means that the harvest date is the 25th. It's stated Tamaki Damo came back to the Higashikata house 6 months after the earthquake, putting the month JoJolion takes place in September.

Hey. What is your source on the dates in the time-line you added?