# Q: Why can't programmers tell the difference between Christmas and Halloween?

A: Because DEC25 = OCT31

**Explanation: **
DEC25 means Decimal 25 - so the number 25.

OCT31 means Octal 31 - which is 25 (for those who do not remember their
math, octal is base 8).

**Still confused? Well, lets count:**

DEC = OCT DEC = OCT DEC = OCT DEC = OCT
00 00 08 10 16 20 24 30
01 01 09 11 17 21 25 31
02 02 10 12 18 22
03 03 11 13 19 23
04 04 12 14 20 24
05 05 13 15 21 25
06 06 14 16 22 26
07 07 15 17 23 27