analytics-utils: localTime() offset hour is wrong in negative half-hour timezones #524

localTime() in analytics-utils returns the wrong offset hour in negative half-hour timezones.

Steps to reproduce

process.env.TZ = 'Pacific/Marquesas'  // UTC-09:30
localTime().slice(-6)                 // "-10:30"

process.env.TZ = 'America/St_Johns'   // UTC-03:30 (UTC-02:30 in summer)
localTime().slice(-6)                 // "-04:30" (or "-03:30" in summer)

Expected
-09:30 and -03:30 (or -02:30).

Cause
The hour is built with pad(tzo / 60), and pad does Math.abs(Math.floor(n)). For UTC-09:30, Math.floor(-9.5) is -10, so the hour is off by one in every negative half-hour zone. Positive and whole-hour zones are fine.

Version: analytics-utils 1.1.1 (master)