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windowsiana.go
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// Written by Gary Barnett in 2018 as public domain software. See LICENSE
// Package windowsiana provides support in converting date timezones from
// the non-standard windows timezone format into UTC. It also provides a function
// to return a timezone-aware date given a date string and an IANA timezone
// the date can then be used as a UTC date via the .UTC() function
package windowsiana
import (
"errors"
"time"
)
// WinIANA is a pseudo constant that provides a mapping between the Windows timezones and the IANA zones
// CAUTION : I can't vouch for the ongoing reliability/accuracy of the mapping, which is partly why
// I've made this an accessible variable so that you can update it at runtime if needs be
var WinIANA = map[string]string{
"(UTC-12:00) International Date Line West": "Etc/GMT+12",
"(UTC-11:00) Co-ordinated Universal Time-11": "Etc/GMT+11",
"(UTC-11:00) Coordinated Universal Time-11": "Etc/GMT+11",
"(UTC-10:00) Aleutian Islands": "US/Aleutian",
"(UTC-10:00) Hawaii": "Pacific/Honolulu",
"(UTC-09:30) Marquesas Islands": "Pacific/Marquesas",
"(UTC-09:00) Alaska": "America/Anchorage",
"(UTC-09:00) Co-ordinated Universal Time-09": "Etc/GMT+9",
"(UTC-09:00) Coordinated Universal Time-09": "Etc/GMT+9",
"(UTC-08:00) Baja California": "America/Tijuana",
"(UTC-08:00) Co-ordinated Universal Time-08": "Etc/GMT+8",
"(UTC-08:00) Coordinated Universal Time-08": "Etc/GMT+8",
"(UTC-08:00) Pacific Time (US & Canada)": "America/Los_Angeles",
"(UTC-07:00) Arizona": "America/Phoenix",
"(UTC-07:00) Chihuahua, La Paz, Mazatlan": "America/Chihuahua",
"(UTC-07:00) Mountain Time (US & Canada)": "America/Denver",
"(UTC-07:00) Yukon": "Etc/GMT+7",
"(UTC-06:00) Central America": "America/Guatemala",
"(UTC-06:00) Central Time (US & Canada)": "America/Chicago",
"(UTC-06:00) Easter Island": "Pacific/Easter",
"(UTC-06:00) Guadalajara, Mexico City, Monterrey": "America/Mexico_City",
"(UTC-06:00) Saskatchewan": "America/Regina",
"(UTC-05:00) Bogota, Lima, Quito, Rio Branco": "America/Bogota",
"(UTC-05:00) Chetumal": "America/Cancun",
"(UTC-05:00) Eastern Time (US & Canada)": "America/New_York",
"(UTC-05:00) Haiti": "America/Port-au-Prince",
"(UTC-05:00) Havana": "America/Havana",
"(UTC-05:00) Indiana (East)": "America/Indianapolis",
"(UTC-05:00) Turks and Caicos": "Etc/GMT+5",
"(UTC-04:00) Asuncion": "America/Asuncion",
"(UTC-04:00) Atlantic Time (Canada)": "America/Halifax",
"(UTC-04:00) Caracas": "America/Caracas",
"(UTC-04:00) Cuiaba": "America/Cuiaba",
"(UTC-04:00) Georgetown, La Paz, Manaus, San Juan": "America/La_Paz",
"(UTC-04:00) Santiago": "America/Santiago",
"(UTC-04:00) Turks and Caicos": "America/Grand_Turk",
"(UTC-03:30) Newfoundland": "America/St_Johns",
"(UTC-03:00) Araguaina": "America/Araguaina",
"(UTC-03:00) Brasilia": "America/Sao_Paulo",
"(UTC-03:00) Cayenne, Fortaleza": "America/Cayenne",
"(UTC-03:00) City of Buenos Aires": "America/Buenos_Aires",
"(UTC-03:00) Greenland": "America/Godthab",
"(UTC-03:00) Montevideo": "America/Montevideo",
"(UTC-03:00) Punta Arenas": "America/Punta_Arenas",
"(UTC-03:00) Saint Pierre and Miquelon": "America/Miquelon",
"(UTC-03:00) Salvador": "America/Bahia",
"(UTC-02:00) Co-ordinated Universal Time-02": "Etc/GMT+2",
"(UTC-02:00) Coordinated Universal Time-02": "Etc/GMT+2",
"(UTC-02:00) Mid-Atlantic - Old": "Etc/GMT+2",
"(UTC-01:00) Azores": "Atlantic/Azores",
"(UTC-01:00) Cabo Verde Is.": "Atlantic/Cape_Verde",
"(UTC) Co-ordinated Universal Time": "Etc/GMT",
"(UTC) Coordinated Universal Time": "Etc/GMT",
"(UTC+00:00) Casablanca": "Africa/Casablanca",
"(UTC+00:00) Dublin, Edinburgh, Lisbon, London": "Europe/London",
"(UTC+00:00) Monrovia, Reykjavik": "Atlantic/Reykjavik",
"(UTC+01:00) Amsterdam, Berlin, Bern, Rome, Stockholm, Vienna": "Europe/Berlin",
"(UTC+01:00) Belgrade, Bratislava, Budapest, Ljubljana, Prague": "Europe/Budapest",
"(UTC+01:00) Brussels, Copenhagen, Madrid, Paris": "Europe/Paris",
"(UTC+01:00) Casablanca": "Africa/Casablanca",
"(UTC+01:00) Sarajevo, Skopje, Warsaw, Zagreb": "Europe/Warsaw",
"(UTC+01:00) West Central Africa": "Africa/Lagos",
"(UTC+01:00) Windhoek": "Africa/Windhoek",
"(UTC+02:00) Amman": "Asia/Amman",
"(UTC+02:00) Athens, Bucharest": "Europe/Bucharest",
"(UTC+02:00) Beirut": "Asia/Beirut",
"(UTC+02:00) Cairo": "Africa/Cairo",
"(UTC+02:00) Chisinau": "Europe/Chisinau",
"(UTC+02:00) Damascus": "Asia/Damascus",
"(UTC+02:00) Gaza, Hebron": "Asia/Gaza",
"(UTC+02:00) Harare, Pretoria": "Africa/Johannesburg",
"(UTC+02:00) Helsinki, Kyiv, Riga, Sofia, Tallinn, Vilnius": "Europe/Kiev",
"(UTC+02:00) Istanbul": "Europe/Istanbul",
"(UTC+03:00) Istanbul": "Europe/Istanbul",
"(UTC+02:00) Jerusalem": "Asia/Jerusalem",
"(UTC+02:00) Juba": "Africa/Juba",
"(UTC+02:00) Kaliningrad": "Europe/Kaliningrad",
"(UTC+02:00) Windhoek": "Africa/Windhoek",
"(UTC+02:00) Khartoum": "Africa/Khartoum",
"(UTC+02:00) Tripoli": "Africa/Tripoli",
"(UTC+03:00) Baghdad": "Asia/Baghdad",
"(UTC+03:00) Kuwait, Riyadh": "Asia/Riyadh",
"(UTC+03:00) Minsk": "Europe/Minsk",
"(UTC+03:00) Moscow, St. Petersburg": "Europe/Moscow",
"(UTC+03:00) Moscow, St. Petersburg, Volgograd": "Europe/Moscow",
"(UTC+03:00) Nairobi": "Africa/Nairobi",
"(UTC+03:00) Volgograd": "Europe/Volgograd",
"(UTC+03:30) Tehran": "Asia/Tehran",
"(UTC+04:00) Abu Dhabi, Muscat": "Asia/Dubai",
"(UTC+04:00) Astrakhan, Ulyanovsk": "Europe/Samara",
"(UTC+04:00) Baku": "Asia/Baku",
"(UTC+04:00) Izhevsk, Samara": "Europe/Samara",
"(UTC+04:00) Port Louis": "Indian/Mauritius",
"(UTC+04:00) Saratov": "Europe/Saratov",
"(UTC+04:00) Tbilisi": "Asia/Tbilisi",
"(UTC+04:00) Volgograd": "Europe/Volgograd",
"(UTC+04:00) Yerevan": "Asia/Yerevan",
"(UTC+04:30) Kabul": "Asia/Kabul",
"(UTC+05:00) Ashgabat, Tashkent": "Asia/Tashkent",
"(UTC+05:00) Ekaterinburg": "Asia/Yekaterinburg",
"(UTC+05:00) Islamabad, Karachi": "Asia/Karachi",
"(UTC+05:00) Qyzylorda": "Asia/Qyzylorda",
"(UTC+05:30) Chennai, Kolkata, Mumbai, New Delhi": "Asia/Calcutta",
"(UTC+05:30) Sri Jayawardenepura": "Asia/Colombo",
"(UTC+05:45) Kathmandu": "Asia/Kathmandu",
"(UTC+06:00) Astana": "Asia/Almaty",
"(UTC+06:00) Dhaka": "Asia/Dhaka",
"(UTC+06:00) Omsk": "Asia/Omsk",
"(UTC+06:00) Novosibirsk": "Asia/Novosibirsk",
"(UTC+06:30) Yangon (Rangoon)": "Asia/Rangoon",
"(UTC+07:00) Bangkok, Hanoi, Jakarta": "Asia/Bangkok",
"(UTC+07:00) Barnaul, Gorno-Altaysk": "Asia/Krasnoyarsk",
"(UTC+07:00) Hovd": "Asia/Hovd",
"(UTC+07:00) Krasnoyarsk": "Asia/Krasnoyarsk",
"(UTC+07:00) Novosibirsk": "Asia/Novosibirsk",
"(UTC+07:00) Tomsk": "Asia/Tomsk",
"(UTC+08:00) Beijing, Chongqing, Hong Kong SAR, Urumqi": "Asia/Shanghai",
"(UTC+08:00) Beijing, Chongqing, Hong Kong, Urumqi": "Asia/Shanghai",
"(UTC+08:00) Irkutsk": "Asia/Irkutsk",
"(UTC+08:00) Kuala Lumpur, Singapore": "Asia/Singapore",
"(UTC+08:00) Perth": "Australia/Perth",
"(UTC+08:00) Taipei": "Asia/Taipei",
"(UTC+08:00) Ulaanbaatar": "Asia/Ulaanbaatar",
"(UTC+08:30) Pyongyang": "Asia/Pyongyang",
"(UTC+09:00) Pyongyang": "Asia/Pyongyang",
"(UTC+08:45) Eucla": "Australia/Eucla",
"(UTC+09:00) Chita": "Asia/Chita",
"(UTC+09:00) Osaka, Sapporo, Tokyo": "Asia/Tokyo",
"(UTC+09:00) Seoul": "Asia/Seoul",
"(UTC+09:00) Yakutsk": "Asia/Yakutsk",
"(UTC+09:30) Adelaide": "Australia/Adelaide",
"(UTC+09:30) Darwin": "Australia/Darwin",
"(UTC+10:00) Brisbane": "Australia/Brisbane",
"(UTC+10:00) Canberra, Melbourne, Sydney": "Australia/Sydney",
"(UTC+10:00) Guam, Port Moresby": "Pacific/Port_Moresby",
"(UTC+10:00) Hobart": "Australia/Hobart",
"(UTC+10:00) Vladivostok": "Asia/Vladivostok",
"(UTC+10:30) Lord Howe Island": "Australia/Lord_Howe",
"(UTC+11:00) Bougainville Island": "Pacific/Bougainville",
"(UTC+11:00) Chokurdakh": "Asia/Srednekolymsk",
"(UTC+11:00) Magadan": "Asia/Magadan",
"(UTC+11:00) Norfolk Island": "Pacific/Norfolk",
"(UTC+11:00) Sakhalin": "Asia/Sakhalin",
"(UTC+11:00) Solomon Is., New Caledonia": "Pacific/Guadalcanal",
"(UTC+12:00) Anadyr, Petropavlovsk-Kamchatsky": "Asia/Kamchatka",
"(UTC+12:00) Auckland, Wellington": "Pacific/Auckland",
"(UTC+12:00) Co-ordinated Universal Time+12": "Etc/GMT-12",
"(UTC+12:00) Coordinated Universal Time+12": "Etc/GMT-12",
"(UTC+12:00) Petropavlovsk-Kamchatsky - Old": "Etc/GMT-12",
"(UTC+12:00) Fiji": "Pacific/Fiji",
"(UTC+12:45) Chatham Islands": "Pacific/Chatham",
"(UTC+13:00) Nuku'alofa": "Pacific/Tongatapu",
"(UTC+13:00) Co-ordinated Universal Time+13": "Etc/GMT-13",
"(UTC+13:00) Coordinated Universal Time+13": "Etc/GMT-13",
"(UTC+13:00) Samoa": "Pacific/Apia",
"(UTC+14:00) Kiritimati Island": "Pacific/Kiritimati",
}
// TimezoneParseWindows accepts a timestring in the format "2006-01-02T15:04:05" as the tstring
// parameter and a windows time zone (eg "(UTC+12:00) Fiji") as the timezone. It will return
// a timezoned date, which will correctly handle daylight savings time if it's in force at the given date
func TimezoneParseWindows(tstring string, tzone string) (time.Time, error) {
ianazone := WinIANA[tzone]
if ianazone == "" {
var t time.Time
return t, errors.New("Could not match windows timezone to IANA timezone")
}
return TimezoneParseIANA(tstring, WinIANA[tzone])
}
// TimezoneParseIANA accepts a timestring in the format "2006-01-02T15:04:05" as the tstring
// parameter and am IANA time zone (eg "Pacific/Fiji") as the timezone. It will return
// a timezoned date, which will correctly handle daylight savings time if it's in force at the given date
func TimezoneParseIANA(tstring string, tzone string) (time.Time, error) {
var zulutime time.Time
it, err := time.Parse("2006-01-02T15:04:05", tstring)
if err != nil {
return zulutime, err
}
loc, err := time.LoadLocation(tzone)
if err != nil {
return zulutime, err
}
zulutime = time.Date(it.Year(), it.Month(), it.Day(), it.Hour(), it.Minute(), it.Second(), 0, loc)
return zulutime, nil
}
// StripTimezoneFromDate removes the same point in time and date, but strips apart the timezone
func StripTimezoneFromDate(indate time.Time) time.Time {
return time.Unix(indate.Unix(), 0)
}