There are only 14 possible calendars. January 1 can fall on one of the 7 days. From there all days follow up to the difference between leap years and non-leap years.
They call this the 'Perpetual Calendar'. Ditto to all the comments above. September 6, 2017 is a day that we will all never forget when it comes to St. Martin. That exact day and date will happen again in 2028, but hopefully without a hurricane like Irma.