Log Message:
Updated p5-DateTime to 1.4300.

1.43   2017-05-29

- Added a small optimization for boolification overloading. Rather than
  relying on a fallback to stringification, we now return true directly, which
  is a little faster in cases like "if ($might_be_dt) { ... }".

- The datetime() method now accepts a single argument to use as the separate
  between the date and time portion. This defaults to "T".