DO NOT REPLY [Bug 32520] New: - apr_time_exp_[gmt|tz|lt] return neg microseconds for dates < 1970

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http://issues.apache.org/bugzilla/show_bug.cgi?id=32520

           Summary: apr_time_exp_[gmt|tz|lt] return neg microseconds for
                    dates < 1970
           Product: APR
           Version: HEAD
          Platform: Macintosh
        OS/Version: Mac OS X 10.0
            Status: NEW
          Severity: normal
          Priority: P2
         Component: APR
        AssignedTo: bugs@httpd.apache.org
        ReportedBy: carnold@houston.rr.com


Affects Unix implementation does not appear to affect Windows implementation. 
The offending lines are in explode_time in time.c:

    time_t tt = (t / APR_USEC_PER_SEC) + offset;
    xt->tm_usec = t % APR_USEC_PER_SEC;

If t < 0 (that is less than 1 Jan 1970), then modulo will return negative and
time will be rounded forward.

The attached patch adds two tests and adjusts tt and xt->tm_usec if xt->tm_usec
is negative.

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