Datetimes and times with negative representation don't display properly

[adam-antonik]

A very minor but annoying issue

> 1960-01-01T01:01:01.123456
1960-01-01T01:01:02.-876544

Solving this seems to just need something like the following added to showDateTime

inline std::string showDateTime(long x) {
  int64_t s  = x / (1000L * 1000L);
  int64_t us = x % (1000L * 1000L);

  if (us < 0) {
    s -= 1;
    us += 1000L * 1000L;
  }
  [...]
}

Similarly for showTime.

[kthielen]

Oops, thank you! I can put in a PR later. :)

[adam-antonik]

If you're going to threaten me like that, then whilst you're there:
> 01:01:02.123
01:01:02.000123

TTIME and TDATETIME both allow 3 digits after the dot, but still parse it as microseconds. 'u' needs to be multiplied by 1000 if s_u.second has length 3.

[kthielen]

Good catch. >_<

[kthielen]

I unintentionally pushed these changes to an existing PR, but I think they're small enough to go in anyway (the PR in question is also very minor):

#339

[kthielen]

These two fixes were merged to master.