The base eight year 3000 happened in our base ten year of 1536, and octal world's next millennium at the year 4000 will be coming up in our year 2048. Dow 17,000 Isn't Special.

It's simple: I specified that I wanted octal (base-8) output, but by using the leading zero, I also indicated that I was specifying a value in octal too. Ergo, 0500 = 500. That's nice, but no binary, ...

Just specify the obase (output base) value as 10, the ibase (input base) number as 16 if the starting number of hex, 8 if it’s octal and 2 if it’s binary as in the examples shown below.