Friday the 13th

What a day. I'm really curious how many days of Friday the 13th we can get in a year? Anyhow, I hope your day today didn't turn out ominous. Mine? I felt sluggish the whole day at work. Fortunately, my day was slightly illuminated by a simple and light dinner at Soup Spoon with Dan and followed by a free dessert treat at Canele Patisserie from Edwin, the manager of the outlet. Really, this was enough to salvage the day!

For your info...

Friday the 13th is considered a day of bad luck in English-, French- and Portuguese-speaking countries around the world, as well as in Germany, Finland, The Netherlands, Belgium, Poland, Bulgaria, Denmark, Sweden, Norway, Czech Republic, Slovakia and Slovenia.
Similar superstitions exist in some other traditions. In Greece, Romania and Spanish-speaking countries, for example, it is Tuesday the 13th that is considered unlucky. In Italy it is Friday the 17th.
The fear of Friday the 13th is called paraskavedekatriaphobia,, a word derived from the concatenation of the Greek words Paraskeví (Παρασκευή) (meaning Friday), and dekatreís (δεκατρείς) (meaning thirteen), attached to phobía (φοβία) (meaning phobia). The term is a specialized form of triskaidekaphobia, a simple phobia (fear) of the number thirteen appearing in any case.

According to the Stress Management Center and Phobia Institute in Asheville, North Carolina, more than 67 million people are affected by a fear of this day. Some people are so paralyzed by fear that they avoid their normal routines like doing business, taking flights or even getting out of bed. "$800 or $900 million is lost in business on this day". Despite this, representatives for both Delta and Continental Airlines say that their airlines don't suffer from any noticeable drop in travel on those Fridays.

The answer to my curiosity!

This sequence, here given for 2001–2028, repeats every 28 years from 1901 to 2099. The months with a Friday the 13th are determined by the Dominical letter (G, F, GF, etc.) of the year. Any month that begins on a Sunday will contain a Friday the 13th.
Every year has at least one and at most three Fridays the 13th, with 688 occurrences during each 400-year Gregorian cycle (146,097 days).
The longest period that can occur without a Friday the 13th is fourteen months, either from July to September the following year (e.g. in 2001/2002 and 2012/13), or from August to October in a leap year (e.g. in 2027/28).