Electrical engineer Aziz Inan, of the University of Portland, recently noticed that April 1st, 2009 is a square root date. From USA Today:

Of course, this is of no significance whatsoever. Or is it???

April Fool's Day, April 1, 2009 is 04/01/2009, or 4012009, which has 2003 as a square root (2003 * 2003 = 4012009.)...

The next April Fool's square date doesn't fall until April 1, 6016 (2004*2004 = 4016016.)

The next April Fool's square date doesn't fall until April 1, 6016 (2004*2004 = 4016016.)

Of course, this is of no significance whatsoever. Or is it???

## Comments

(3312400 = 1820*1820)

On March 31, 2400, I'll be celebrating my 441st birthday, so I appreciate knowing it's a square root day.

http://en.wikipedia.org/wiki/Calendar_date shows an interesting overview of date formatting around the world, both on a map and by listed countries: the most common is dd/mm/yyyy, used by 106 countries; only six use mm/dd/yyyy!

In holland we note april-fools as:

01-04-2009

and then things don't seem to be a square root al all

the root of 01042009 = 1020,7884207807218264635454180032

I like the idea of spraying fake snow on someone's windows over night--if they don't shoot you as a prowler

If you have to ask, you've been fooled.

(01-04-2441 = 1042441 = 1021*1021)

The last was 400 AD.

(01-04-0400 = 1040400 = 1020*1020)

Thanks to my math-whiz brother for this observation.

(I commonly use YYYYMMDD on archive filenames so they are easily sortable. This is the ISO 8601 standard for the truly geeky.)