OT - date digit challenge « Next Oldest | Next Newest »

 ▼ Don Shepherd Posting Freak Posts: 1,392 Threads: 142 Joined: Jun 2007 04-06-2006, 10:56 AM 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 Posting Freak Posts: 2,448 Threads: 90 Joined: Jul 2005 04-06-2006, 11:12 AM November 29, 2005 January 1, 2007 ▼ Don Shepherd Posting Freak Posts: 1,392 Threads: 142 Joined: Jun 2007 04-06-2006, 11:44 AM Hey Bill, that's right if you only consider the 2 digit year. What if you consider the 4 digit year? ▼ bill platt Posting Freak Posts: 2,448 Threads: 90 Joined: Jul 2005 04-06-2006, 11:54 AM 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 Posting Freak Posts: 1,392 Threads: 142 Joined: Jun 2007 04-06-2006, 12:03 PM Yes, you are right, I didn't explain it well enough. I wanted all digits to be odd. Nov 19, 1999 ▼ bill platt Posting Freak Posts: 2,448 Threads: 90 Joined: Jul 2005 04-06-2006, 12:11 PM 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 Posting Freak Posts: 1,392 Threads: 142 Joined: Jun 2007 04-06-2006, 02:22 PM 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.

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