The most important way US elections are rigged is not voter disenfranchisement, touch screen voting machines or tampered software in ballot scanners, but media manipulation of public consciousness about the candidates.
30 days has September, April, June and November. All the rest have 31 Except February alone, Which has 28 days clear And 29 in each leap year. Or you can use the knuckle method: A knuckle is 31 days, and in between each knuckle it isn't. And where you hands meet, the two knuckles are July, August, which both have 31 days. (Note: the last knuckle isn't used). Example: October is on a knuckles, so it has 31 days.
Only February has 28 days in the month, but in a leap year, there are 29 days of February. The calculation of the week of the common year is done as follow: In the day, there are 8760 hours, 525600 minutes, and 31536000 seconds. The months in which the number of days is 30 are September, April, June, and November.