Change time function names to be more consistent, and check for zero divides, from Michael Reifenberg.

Bruce Momjian <bruce@momjian.us>

Commit: 0ab29212904dc4352646acaf416b6ab1a367d661
Author: Bruce Momjian <bruce@momjian.us>
Date: 1997-08-21T23:57:00Z
Releases: 7.1.1
Change time function names to be more consistent, and check for zero divides, from Michael Reifenberg.

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