handling timezone with offset

.gitignore

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+
+# Created by https://www.gitignore.io/api/node
+
+### Node ###
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+logs
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+
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Gemfile

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+source "https://rubygems.org"
+
+gem "tzinfo"
+gem "tzinfo-data"
+gem "activesupport"

Gemfile.lock

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+GEM
+  remote: https://rubygems.org/
+  specs:
+    activesupport (5.2.1)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      i18n (>= 0.7, < 2)
+      minitest (~> 5.1)
+      tzinfo (~> 1.1)
+    concurrent-ruby (1.0.5)
+    i18n (1.1.0)
+      concurrent-ruby (~> 1.0)
+    minitest (5.11.3)
+    thread_safe (0.3.6)
+    tzinfo (1.2.5)
+      thread_safe (~> 0.1)
+    tzinfo-data (1.2018.5)
+      tzinfo (>= 1.0.0)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  activesupport
+  tzinfo
+  tzinfo-data
+
+BUNDLED WITH
+   1.16.2

generate.rb

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+require 'active_support/all'
+
+zones = Hash.new
+timezones = ActiveSupport::TimeZone.all.each { |tz| 
+    zones[tz.tzinfo.name] = tz.utc_offset / 60 * -1
+}
+
+File.open("offsets.json", 'w') { |file| file.write(zones.to_json) }

generated/offsets.json

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+{"Etc/GMT+12":720,"Pacific/Pago_Pago":660,"Pacific/Midway":660,"Pacific/Honolulu":600,"America/Juneau":540,"America/Los_Angeles":480,"America/Tijuana":480,"America/Phoenix":420,"America/Chihuahua":420,"America/Mazatlan":420,"America/Denver":420,"America/Guatemala":360,"America/Chicago":360,"America/Mexico_City":360,"America/Monterrey":360,"America/Regina":360,"America/Bogota":300,"America/New_York":300,"America/Indiana/Indianapolis":300,"America/Lima":300,"America/Halifax":240,"America/Caracas":240,"America/Guyana":240,"America/La_Paz":240,"America/Puerto_Rico":240,"America/Santiago":240,"America/St_Johns":210,"America/Sao_Paulo":180,"America/Argentina/Buenos_Aires":180,"America/Godthab":180,"America/Montevideo":180,"Atlantic/South_Georgia":120,"Atlantic/Azores":60,"Atlantic/Cape_Verde":60,"Africa/Casablanca":0,"Europe/London":0,"Europe/Lisbon":0,"Africa/Monrovia":0,"Etc/UTC":0,"Europe/Amsterdam":-60,"Europe/Belgrade":-60,"Europe/Berlin":-60,"Europe/Zurich":-60,"Europe/Bratislava":-60,"Europe/Brussels":-60,"Europe/Budapest":-60,"Europe/Copenhagen":-60,"Europe/Dublin":-60,"Europe/Ljubljana":-60,"Europe/Madrid":-60,"Europe/Paris":-60,"Europe/Prague":-60,"Europe/Rome":-60,"Europe/Sarajevo":-60,"Europe/Skopje":-60,"Europe/Stockholm":-60,"Europe/Vienna":-60,"Europe/Warsaw":-60,"Africa/Algiers":-60,"Europe/Zagreb":-60,"Europe/Athens":-120,"Europe/Bucharest":-120,"Africa/Cairo":-120,"Africa/Harare":-120,"Europe/Helsinki":-120,"Asia/Jerusalem":-120,"Europe/Kaliningrad":-120,"Europe/Kiev":-120,"Africa/Johannesburg":-120,"Europe/Riga":-120,"Europe/Sofia":-120,"Europe/Tallinn":-120,"Europe/Vilnius":-120,"Asia/Baghdad":-180,"Europe/Istanbul":-180,"Asia/Kuwait":-180,"Europe/Minsk":-180,"Europe/Moscow":-180,"Africa/Nairobi":-180,"Asia/Riyadh":-180,"Europe/Volgograd":-180,"Asia/Tehran":-210,"Asia/Muscat":-240,"Asia/Baku":-240,"Europe/Samara":-240,"Asia/Tbilisi":-240,"Asia/Yerevan":-240,"Asia/Kabul":-270,"Asia/Yekaterinburg":-300,"Asia/Karachi":-300,"Asia/Tashkent":-300,"Asia/Kolkata":-330,"Asia/Colombo":-330,"Asia/Kathmandu":-345,"Asia/Almaty":-360,"Asia/Dhaka":-360,"Asia/Urumqi":-360,"Asia/Rangoon":-390,"Asia/Bangkok":-420,"Asia/Jakarta":-420,"Asia/Krasnoyarsk":-420,"Asia/Novosibirsk":-420,"Asia/Shanghai":-480,"Asia/Chongqing":-480,"Asia/Hong_Kong":-480,"Asia/Irkutsk":-480,"Asia/Kuala_Lumpur":-480,"Australia/Perth":-480,"Asia/Singapore":-480,"Asia/Taipei":-480,"Asia/Ulaanbaatar":-480,"Asia/Tokyo":-540,"Asia/Seoul":-540,"Asia/Yakutsk":-540,"Australia/Adelaide":-570,"Australia/Darwin":-570,"Australia/Brisbane":-600,"Australia/Melbourne":-600,"Pacific/Guam":-600,"Australia/Hobart":-600,"Pacific/Port_Moresby":-600,"Australia/Sydney":-600,"Asia/Vladivostok":-600,"Asia/Magadan":-660,"Pacific/Noumea":-660,"Pacific/Guadalcanal":-660,"Asia/Srednekolymsk":-660,"Pacific/Auckland":-720,"Pacific/Fiji":-720,"Asia/Kamchatka":-720,"Pacific/Majuro":-720,"Pacific/Chatham":-765,"Pacific/Tongatapu":-780,"Pacific/Apia":-780,"Pacific/Fakaofo":-780}