OT - date digit challenge



#5

OK guys, something light.

Yesterday it was 01:23:45 6/7/89. Big deal. I liked 01:23:45 6/7/89 better anyhow.

Now, for the challenge. What was the last date that had all odd number digits? When will the next date be with all odd digits?


#6

November 29, 2005
January 1, 2007


#7

Hey Bill, that's right if you only consider the 2 digit year. What if you consider the 4 digit year?


#8

There's no difference. Odd numbers are a function of the last digit.

Or do you want all *digits* to be odd?

In that case, you hav to go back to Nov 29, 1999 and forward to Jan 1, 3111!


#9

Yes, you are right, I didn't explain it well enough. I wanted all digits to be odd.

Nov 19, 1999


#10

oh, roight. sorry.

Now, same problem as before, except that if you add up all the digits, the sum must also be odd. (both of these answers are even).

Edited: 6 Apr 2006, 12:13 p.m.


#11

Bill, you're a crafty guy!

11/9/1999

1/11/3111

Neither of which has ANYTHING to do with my teaching portfolio, which I'm supposed to be working on today.


Possibly Related Threads…
Thread Author Replies Views Last Post
  Prime: how to detect date format giancarlo 1 1,536 12-02-2013, 11:21 AM
Last Post: Michael de Estrada
  Date/time formats R. Pienne 4 2,283 11-01-2013, 12:43 PM
Last Post: Marcus von Cube, Germany
  How to set the Date.Time etc on a WP34S Harold A Climer 4 1,968 10-29-2013, 09:32 PM
Last Post: FORTIN Pascal
  Date/time programs for the HP 35s R. Pienne 0 1,152 10-03-2013, 02:37 PM
Last Post: R. Pienne
  Date & Time disappear on WP 34S René Franquinet 16 5,483 12-10-2012, 08:24 AM
Last Post: Walter B
  A little OT: Blank date fields in 200LX database Dave Britten 1 1,290 07-12-2012, 06:11 PM
Last Post: Dave Britten
  HP-32E missing digit Matt Agajanian 11 3,052 03-21-2012, 11:08 PM
Last Post: Luiz C. Vieira (Brazil)
  HP SMB 15C LE ship date Scott Newell 9 2,516 12-17-2011, 11:25 PM
Last Post: Scott Newell
  41CX-MCODE: Digit Sum function Ángel Martin 17 4,433 12-09-2011, 08:06 AM
Last Post: Ángel Martin
  38E/C, 12C, 12CP date arithmetic bug Katie Wasserman 26 5,950 10-19-2011, 08:57 PM
Last Post: Miguel Toro

Forum Jump: