The calculation method is:

1, August 4th, 2004 is Wednesday, and in 100 days: 100/7 = 14...2, so it takes Wednesday and two days, and the result is Friday.

2. September 2004 1 is Wednesday, June 65438+February 8 this year: this involves the month. There are 30 days in September, 3 1 day in June and 30 days in June.

Extended data:

When Augustus was ready to correct the leap year mistakes, three leap years had passed, so he ordered the leap year to stop from the eighth year BC to the fourth year AD, that is, the fifth year BC, 1 BC and the fourth year AD were still normal years, and then it was resumed as a leap every four years.

To commemorate this achievement, the Roman Senate passed a resolution to rename August of julian calendar "Augustus", that is, Augustus Month, because he won a great military victory in this month.

However, this month is a miscarriage, and I feel a little inferior. Moreover, the Romans regard odd numbers as their lucky numbers, but 30 days are even numbers. So they took a day from the middle of February and added it to the month of Augustus, and August was 365,438+0 days. Poor February has only 28 days in a normal year and 29 days in a leap year that comes once every four years. July, August and September are three months in a row. It looks uncomfortable and inconvenient to use.

Change September to 30 days, 65438+1month to 3 1 day,165438+1month to 30 days, and 65438+February to 3 1 day. This broke the law of the alternation of the sun and the moon, and it is still affected today after 2000.

So now we sing the monthly song, 1, 3, 5, 7, 8, 10, La, 3 1 day is never bad.

Baidu encyclopedia-solar calendar