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Is it true that the weekday pattern of a given month only happens every 823 years?

This is a hoax.

The rumor is often presented (see graphic below) as such:

GOOD LUCK EVERYONE!! This year October has 5 Mondays, 5 Tuesdays and 5 Wednesdays. This happens once every 823 years. This is called money bags. So copy this to your status and money will arrive within 4 days. Based on Chinese Feng Shui. The one who does not copy, will be without money. Copy within 11 mins of reading. Can’t hurt so I did it

The rumor varies, often listing whatever month is coming up. In this case, it is October 2012. March of 2013 is another recent example.

The reality is that this pattern is actually quite a common occurrence. If you list every occasion this specific pattern of 5 Mondays, Tuesdays, and Wednesdays, (across all months), you’ll find that it happens on average once a year. For any given month, the pattern repeats every several years. Take a look at the 20-year list of occurrences below:

• July 2002
• December 2003
• March 2004
• August 2005
• May 2006
• January 2007
• October 2007
• December 2008
• March 2010
• August 2011
• October 2012
• July 2013
• December 2014
• August 2016
• May 2017
• January 2018
• October 2018
• July 2019
• March 2021
• August 2022

Images such as this are passed around with false claims of an 823 year pattern.

As you can see, months containing 5 Mondays, 5 Tuesdays, and 5 Wednesday occurs 20 times over a 20 year period from 2002 to 2022. For a specific month, such as October 2012, it will occur as often as 5 years and no more than 11 years. There is a pattern of re-occurrence for these months which, if we begin with October 2012, is

6 years (2018)
11 years (2029)
6 years (2035)
5 years (2040)

Thus, there will never be more 11 years before this same pattern of a 31-day falling on a Monday repeats for a given month.

Other variants of the rumor state that it only happens for months beginning on a Saturday, or different days of the week, such as March 2013, which has 5 Fridays, 5 Saturdays, and 5 Sundays. The explanation and patterns above still apply.

As far as the good luck “money bags” angle goes, there is nothing in Feng Shui regarding re-posting messages or calendars with 5 specific weekdays. Plus, if the 823-year angle is wrong, why should we believe the “good luck” part of this message?

If you see someone posting this 823 rumor, link this article or video below to set them straight.

Article updated March 20, 2013