OT - date digit challenge

[Don Shepherd]

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?

[bill platt]

November 29, 2005
January 1, 2007

[Don Shepherd]

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

[bill platt]

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!

[Don Shepherd]

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

Nov 19, 1999

[bill platt]

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.

[Don Shepherd]

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.