* Replace usages of `Timex.to_unix` with native API
* Wrap call to `Timex.is_valid_timezone?`
* Wrap calls to `Timex.today(tz)`
* Replace `Timex.today()` with `Date.utc_today()`
* Replace `Timex.now()` with `DateTime.utc_now()`
* Replace `Timex.compare` with `Date.compare`
* Wrap `Timex.diff` calls
* Replace `Timex.Timezone.convert` with `DateTime.shift_zone!`
* Wrap `Timex.parse!`
* Replace `Timex.to_date` with native API calls
* Replace `Timex.beginning|end_of...` with native API calls for Date
* Wrap `Timex.beginning|end_of...` for DateTimes and Dates for years
* Replace `Timex.format(!)` with native API calls
* Replace `Timex.to_naive_datetime` with native API calls
* Wrap time humanizing routines using Timex
* Remove unnecessary `use Timex` instances
* Replace `Timex.shift` with native API calls
* Make `QueryParser.parse_date` handle gaps and ambiguities gracefully
* Replace `Timex.now(tz)` with `DateTime.now!(tz)`
* Use a more suitable Date function for comparison (h/t @aerosol)
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