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[Newgistics] Time Zone is America/Denver - MT(MST/MDT)

Tadashi Shigeoka ·  Sat, September 28, 2019

I’ll share the investigation results where I found that Newgistics time zone has tz database name America/Denver and is MT (MST/MDT).

Newgistics

Overview

  • Newgistics API documentation doesn't clearly specify the timezone
  • When I asked a Newgistics representative, they gave an ambiguous answer: "probably MT"
  • Since MT has regions with and without DST, knowing the specific area is also important
  • Newgistics timezone is America/Denver

Time Zone Background Knowledge

MT (MST/MDT)

Mountain Time Areas

The tz database names corresponding to Mountain Time are as follows:

  • America/Boise
  • America/Cambridge_Bay
  • America/Denver
  • America/Edmonton
  • America/Inuvik
  • America/Ojinaga
  • America/Yellowknife
Time zone Currently Mountain Daylight Time (MDT), UTC -6 Standard time (Mountain Standard Time (MST), UTC -7) starts November 3, 2019

The IANA time zone identifiers for Mountain Time are America/Boise, America/Cambridge_Bay, America/Denver, America/Edmonton, America/Inuvik, America/Ojinaga and America/Yellowknife.

ref: Mountain Time | Time.is

America/Phoenix has no DST

Although not listed above, there are cases like tz database name America/Phoenix where it’s just MST without DST (Daylight Saving Time).

Note that these abbreviations may change depending on the time zone offset. This helps to distinguish offsets between places that may or may not use DST.

// Denver observes DST moment.tz([2012, 0], ‘America/Denver’).format(‘Z z’); // -07:00 MST moment.tz([2012, 5], ‘America/Denver’).format(‘Z z’); // -06:00 MDT // Phoenix does not observe DST moment.tz([2012, 0], ‘America/Phoenix’).format(‘Z z’); // -07:00 MST moment.tz([2012, 5], ‘America/Phoenix’).format(‘Z z’); // -07:00 MST

Formatting Additions - Moment Timezone | Docs

Newgistics is America/Denver

According to rocketsofawesome/newgistics-ruby: Ruby client for the Newgistics API, Newgistics appears to use America/Denver.

Option time_zone

Description The time zone used by Newgistics. When the API sends timestamps back it doesn’t include a time zone, if it’s not provided, the value of this setting will be used when parsing the timestamps into Time objects. You shouldn’t need to change this setting

Default Value “America/Denver”

That’s all from the Gemba.

Reference Information