In Germany, the date is written Day/Month/Year. The date is not written Month/Day/Year like it is in The States. Thus, today being January 11, 2015 the date is written as follows 11/01/15 and not as 01/11/15. Although this seems simple enough to remember, it can lead to accidentally voiding legal documents and misreading expiration dates on food products.
Also important to note, the first day of the week in German is Monday and the last day of the week is Sunday. Calendars and Schedules always start with Monday so a quick glance without paying attention might lead to miscommunications about which day of the week something is on.
November 9th, 1989:
09/11/89 (in Germany)
September 11th, 1989:
09/11/89 (in The United States)
Montag - Dienstag - Mittwoch - Donnerstag - Freitag - Samstag - Sonntag
Sunday - Monday - Tuesday - Wednesday - Thursday - Friday - Saturday