Timeline

The timeline is an in-universe timeline of events from the 5-toubun no Hanayome series.

Story
Please note the following:
 * "~" indicates prediction. Actual/confirmed time and dates shown in the series will be written normally without "~."
 * Bolded date indicates official/exact date and explicitly shown in the manga.
 * Details in the manga's tankōbon release strongly suggest that the series began from the canonical year of 2018; however, the dates from Chapter 38 onward correlates with 2017, which becomes 2018 again after New year in Chapter 51.

Second Year High School
In Chapter 7, a radio broadcast reveals the date to be Sunday, September 30.