Why is January month 0 in Java Calendar?

In java.util.Calendar, January is defined as month 0, not month 1. Is there any specific reason to that ?
I have seen many people getting confused about that…

C based languages copy C to some degree. The tm structure (defined in time.h) has an integer field tm_mon with the (commented) range of 0-11.

 

C based languages start arrays at index 0. So this was convenient for outputting a string in an array of month names, with tm_mon as the index.