July 2011 – 5 Fridays, 5 Saturdays, 5 Sundays

It is perfectly true that July 2011 has 5 Fridays, 5 Saturdays and 5 Sundays. However, such a combination occurs far more often than every 823 years. The last occurrence was in July 2005 while the next occurrence will take place in July 2016. The message is just a revamped version of very similar- and equally erroneous – messages about August and October 2010.

This silly piece of nonsense circulates via email and social networking websites and is now in its third incarnation. The message imparts the “interesting” fact that July 2011 will have 5 Fridays, 5 Saturdays and 5 Sundays. It claims that such a combination of days only occurs once every 823 years. It also claims that those who forward the message to their friends will receive money within four days.

It is perfectly true that July 2011 will have 5 Fridays, 5 Saturdays and 5 Sundays. However, the claim that such an occurrence for July only happens once every 823 years is nonsense. In fact, such combinations occur in the month of July every few years. As the following calendar shows, the next time a July has 5 Fridays, 5 Saturdays and 5 Sundays will be in the year 2016:

And the same combination of days occurred in July 2005:

And, in any case, there is nothing even remotely unusual about months that have such “interesting” combinations of days. In fact, any month that has 31 days will have three consecutive days that occur five times in the month. Such combinations are commonplace and occur each and every year.

The message is a revamped version of similar – and equally nonsensical – chain letters about August 2010 and October 2010.