The short date format (under storeadmin Administration tab > Site Settings > Short Date) to n/j/y format (which is the default format). Yours was set to Y-m-d format (using dashes instead of forward slashes to separate the month, day, year). I need to make this more clear.
The default short date format is what most people are accustom to: month / day / year
The n/j/y is an internal format which does not convey month / day /year, thus is confusing.
Note that in order to view orders in storeadmin, the format must used slashes (like 8/23/18), not dashes (like 8-23-18).
The short date is used in many places. They are listed below.
- coupon expiration date
- date entered field in items
- order gift receipt
- guestbook date
- packing list order date
- registry event date/due date
- sales report date sold
- stats date
- listing out temp inventory
- event calendar: date of event
- orders: ship date, order date
- registry: event date
- reviews: individual review date