Please note that this is the 8th of the 7th month! Not 10th! So correct Yom Kippur date is September 28th this year.
Information about why correct Yom Kippur is on the 8th can be found here.
This post is the early reminder for people to prepare.
Below is the calendar that shows Yom Kippur month!
And here is the ultimate sign of Yom Kippur: