arc-date
A Date convenience subclass for javascript (ES6)
Install & Test
$ npm install arc-date --save
$ npm run test
Features
- Handles DST when using specific timezones
- Create formatted strings for a specific timezone
- Create formatted strings for local time
- Create formatted strings for UTC
- Create a new date object targeting a time in a specific timezone, taking DST into account
- Setters return
this
to enable chaining
Basic Usage
The following example creates a new ArcDate, and utilizes formatting functions to return a formatted string
const ArcDate = require('arc-date');
let TestDate = new ArcDate(Date.UTC(1981,7,25));
TestDate.format('M jS, Y - h:i A');
TestDate.formatLocal('M jS, Y - h:i A');
TestDate.format('M jS, Y - h:i A', 'America/Toronto');
TestDate.setTZ('America/Toronto');
TestDate.format('M jS, Y - h:i A');
Advanced Usage
In certain scenarios, it can be useful to set a time in a non local timezone that you want to check against in realtime. For this we can create a date, while targeting specific timezones which in turn will return the correct UTC timestamp
const TargetTime = ArcDate.target('America/Toronto', (new ArcDate).setUTCHours(9, 30));
if(Date.now() > TargetTime.getTime()) {
}
API
new ArcDate([See Date Signature])
Create a new ArcDate
object. Requires new
.format(formattingString:String [, tzString: String])
Search for tokens in a string, and run date functions against them to return a formatted string
.formatLocal(formattingString:String)
same as .format
but first applies the current timezoneOffset before returning formatted string
.setTZ(tzString: String)
Sets TZ internally, so format will automatically return correctly adjusted responses.
possible tokens:
d - Day: 01-31
D - Day: Sun-Sat
j - Day: 1-31
l - Day: Sunday-Saturday
N - Day: 1-7 (day of week)
S - Day: Suffix (st,nd,rd,th)
w - Day: 0-6 (zero indexed)
z - Day: 0-364 (zero indexed)
W - Week: 1-52 (of the year)
F - Month: January - December
m - Month: 01-12
M - Month: Jan - Dec,
n - Month: 1-12
t - Month: 28-31 (days in month)
L - Year: false/true (Leap year)
Y - Year: 1993
y - Year: 93
a - Time: am-pm
A - Time: AM-PM
g - Time: 1-12 (hours)
G - Time: 0-23 (hours)
h - Time: 01-12 (hours)
H - Time: 00-23 (hours)
i - Time: 00-59 (minutes)
s - Time: 00-59 (seconds)
x - Time: 0-999 (milliseconds)
X - Time: 000-999 (milliseconds)
possible tz strings:
"Africa/Abidjan": [0, 0],
"Africa/Accra": [0, 0],
"Africa/Algiers": [1, 1],
"Africa/Bissau": [0, 0],
"Africa/Cairo": [2, 2],
"Africa/Casablanca": [0, 1],
"Africa/Ceuta": [1, 2],
"Africa/El_Aaiun": [0, 1],
"Africa/Johannesburg": [2, 2],
"Africa/Juba": [3, 3],
"Africa/Khartoum": [2, 2],
"Africa/Lagos": [1, 1],
"Africa/Maputo": [2, 2],
"Africa/Monrovia": [0, 0],
"Africa/Nairobi": [3, 3],
"Africa/Ndjamena": [1, 1],
"Africa/Tripoli": [2, 2],
"Africa/Tunis": [1, 1],
"Africa/Windhoek": [2, 2],
"America/Adak": [-10, -9, 1],
"America/Anchorage": [-9, -8, 1],
"America/Araguaina": [-3, -3],
"America/Argentina/Buenos_Aires": [-3, -3],
"America/Argentina/Catamarca": [-3, -3],
"America/Argentina/Cordoba": [-3, -3],
"America/Argentina/Jujuy": [-3, -3],
"America/Argentina/La_Rioja": [-3, -3],
"America/Argentina/Mendoza": [-3, -3],
"America/Argentina/Rio_Gallegos": [-3, -3],
"America/Argentina/Salta": [-3, -3],
"America/Argentina/San_Juan": [-3, -3],
"America/Argentina/San_Luis": [-3, -3],
"America/Argentina/Tucuman": [-3, -3],
"America/Argentina/Ushuaia": [-3, -3],
"America/Asuncion": [-4, -3],
"America/Atikokan": [-5, -5],
"America/Bahia": [-3, -3],
"America/Bahia_Banderas": [-6, -5],
"America/Barbados": [-4, -4],
"America/Belem": [-3, -3],
"America/Belize": [-6, -6],
"America/Blanc-Sablon": [-4, -4],
"America/Boa_Vista": [-4, -4],
"America/Bogota": [-5, -5],
"America/Boise": [-7, -6, 1],
"America/Cambridge_Bay": [-7, -6, 1],
"America/Campo_Grande": [-4, -3],
"America/Cancun": [-5, -5],
"America/Caracas": [-4, -4],
"America/Cayenne": [-3, -3],
"America/Chicago": [-6, -5, 1],
"America/Chihuahua": [-7, -6],
"America/Costa_Rica": [-6, -6],
"America/Creston": [-7, -7],
"America/Cuiaba": [-4, -3],
"America/Curacao": [-4, -4],
"America/Danmarkshavn": [0, 0],
"America/Dawson": [-8, -7, 1],
"America/Dawson_Creek": [-7, -7],
"America/Denver": [-7, -6, 1],
"America/Detroit": [-5, -4, 1],
"America/Edmonton": [-7, -6, 1],
"America/Eirunepe": [-5, -5],
"America/El_Salvador": [-6, -6],
"America/Fort_Nelson": [-7, -7],
"America/Fortaleza": [-3, -3],
"America/Glace_Bay": [-4, -3, 1],
"America/Godthab": [-3, -2],
"America/Goose_Bay": [-4, -3, 1],
"America/Grand_Turk": [-4, -4],
"America/Guatemala": [-6, -6],
"America/Guayaquil": [-5, -5],
"America/Guyana": [-4, -4],
"America/Halifax": [-4, -3, 1],
"America/Havana": [-5, -4, 1],
"America/Hermosillo": [-7, -7],
"America/Indiana/Indianapolis": [-5, -4, 1],
"America/Indiana/Knox": [-6, -5, 1],
"America/Indiana/Marengo": [-5, -4, 1],
"America/Indiana/Petersburg": [-5, -4, 1],
"America/Indiana/Tell_City": [-6, -5, 1],
"America/Indiana/Vevay": [-5, -4, 1],
"America/Indiana/Vincennes": [-5, -4, 1],
"America/Indiana/Winamac": [-5, -4, 1],
"America/Inuvik": [-7, -6, 1],
"America/Iqaluit": [-5, -4, 1],
"America/Jamaica": [-5, -5],
"America/Juneau": [-9, -8, 1],
"America/Kentucky/Louisville": [-5, -4, 1],
"America/Kentucky/Monticello": [-5, -4, 1],
"America/La_Paz": [-4, -4],
"America/Lima": [-5, -5],
"America/Los_Angeles": [-8, -7, 1],
"America/Maceio": [-3, -3],
"America/Managua": [-6, -6],
"America/Manaus": [-4, -4],
"America/Martinique": [-4, -4],
"America/Matamoros": [-6, -5, 1],
"America/Mazatlan": [-7, -6],
"America/Menominee": [-6, -5, 1],
"America/Merida": [-6, -5],
"America/Metlakatla": [-9, -8],
"America/Mexico_City": [-6,-5],
"America/Miquelon": [-3,-2, 1],
"America/Moncton": [-4,-3, 1],
"America/Monterrey": [-6,-5],
"America/Montevideo": [-3,-3],
"America/Nassau": [-5,-4, 1],
"America/New_York": [-5,-4, 1],
"America/Nipigon": [-5,-4, 1],
"America/Nome": [-9,-8, 1],
"America/Noronha": [-2,-2],
"America/North_Dakota/Beulah": [-6,-5, 1],
"America/North_Dakota/Center": [-6,-5, 1],
"America/North_Dakota/New_Salem": [-6,-5, 1],
"America/Ojinaga": [-7,-6, 1],
"America/Panama": [-5,-5],
"America/Pangnirtung": [-5,-4, 1],
"America/Paramaribo": [-3,-3],
"America/Phoenix": [-7,-7],
"America/Port_of_Spain": [-4,-4],
"America/Port-au-Prince": [-5,-4, 1],
"America/Porto_Velho": [-4,-4],
"America/Puerto_Rico": [-4,-4],
"America/Punta_Arenas": [-3,-3],
"America/Rainy_River": [-6,-5, 1],
"America/Rankin_Inlet": [-6,-5, 1],
"America/Recife": [-3,-3],
"America/Regina": [-6,-6],
"America/Resolute": [-6,-5, 1],
"America/Rio_Branco": [-5,-5],
"America/Santarem": [-3,-3],
"America/Santiago": [-4,-3],
"America/Santo_Domingo": [-4,-4],
"America/Sao_Paulo": [-3,-2],
"America/Scoresbysund": [-1,0],
"America/Sitka": [-9,-8, 1],
"America/St_Johns": [-3.5,-2.5, 1],
"America/Swift_Current": [-6,-6],
"America/Tegucigalpa": [-6,-6],
"America/Thule": [-4,-3, 1],
"America/Thunder_Bay": [-5,-4, 1],
"America/Tijuana": [-8,-7, 1],
"America/Toronto": [-5,-4, 1],
"America/Vancouver": [-8,-7, 1],
"America/Whitehorse": [-8,-7, 1],
"America/Winnipeg": [-6,-5, 1],
"America/Yakutat": [-9,-8, 1],
"America/Yellowknife": [-7,-6, 1],
"Antarctica/Casey": [11,11],
"Antarctica/Davis": [7,7],
"Antarctica/DumontDUrville": [10,10],
"Antarctica/Macquarie": [11,11],
"Antarctica/Mawson": [5,5],
"Antarctica/Palmer": [-3,-3],
"Antarctica/Rothera": [-3,-3],
"Antarctica/Syowa": [3,3],
"Antarctica/Troll": [0,2],
"Antarctica/Vostok": [6,6],
"Asia/Almaty": [6,6],
"Asia/Amman": [2,3],
"Asia/Anadyr": [12,12],
"Asia/Aqtau": [5,5],
"Asia/Aqtobe": [5,5],
"Asia/Ashgabat": [5,5],
"Asia/Atyrau": [5,5],
"Asia/Baghdad": [3,3],
"Asia/Baku": [4,4],
"Asia/Bangkok": [7,7],
"Asia/Barnaul": [7,7],
"Asia/Beirut": [2,3],
"Asia/Bishkek": [6,6],
"Asia/Brunei": [8,8],
"Asia/Chita": [9,9],
"Asia/Choibalsan": [8,8],
"Asia/Colombo": [5.5,5.5],
"Asia/Damascus": [2,3],
"Asia/Dhaka": [6,6],
"Asia/Dili": [9,9],
"Asia/Dubai": [4,4],
"Asia/Dushanbe": [5,5],
"Asia/Famagusta": [2,2],
"Asia/Gaza": [2,3],
"Asia/Hebron": [2,3],
"Asia/Ho_Chi_Minh": [7,7],
"Asia/Hong_Kong": [8,8],
"Asia/Hovd": [7,7],
"Asia/Irkutsk": [8,8],
"Asia/Jakarta": [7,7],
"Asia/Jayapura": [9,9],
"Asia/Jerusalem": [2,3],
"Asia/Kabul": [4.5, 4.5],
"Asia/Kamchatka": [12,12],
"Asia/Karachi": [5,5],
"Asia/Kathmandu": [5.75, 5.75],
"Asia/Khandyga": [9,9],
"Asia/Kolkata": [5.5, 5.5],
"Asia/Krasnoyarsk": [7,7],
"Asia/Kuala_Lumpur": [8,8],
"Asia/Kuching": [8,8],
"Asia/Macau": [8,8],
"Asia/Magadan": [11,11],
"Asia/Makassar": [8,8],
"Asia/Manila": [8,8],
"Asia/Novokuznetsk": [7,7],
"Asia/Novosibirsk": [7,7],
"Asia/Omsk": [6,6],
"Asia/Oral": [5,5],
"Asia/Pontianak": [7,7],
"Asia/Pyongyang": [9,9],
"Asia/Qatar": [3,3],
"Asia/Qyzylorda": [6,6],
"Asia/Riyadh": [3,3],
"Asia/Sakhalin": [11,11],
"Asia/Samarkand": [5,5],
"Asia/Seoul": [9,9],
"Asia/Shanghai": [8,8],
"Asia/Singapore": [8,8],
"Asia/Srednekolymsk": [11,11],
"Asia/Taipei": [8,8],
"Asia/Tashkent": [5,5],
"Asia/Tbilisi": [4,4],
"Asia/Tehran": [3.5, 4.5],
"Asia/Thimphu": [6,6],
"Asia/Tokyo": [9,9],
"Asia/Tomsk": [7,7],
"Asia/Ulaanbaatar": [8,8],
"Asia/Urumqi": [6,6],
"Asia/Ust-Nera": [10,10],
"Asia/Vladivostok": [10,10],
"Asia/Yakutsk": [9,9],
"Asia/Yangon": [6.5,6.5],
"Asia/Yekaterinburg": [5,5],
"Asia/Yerevan": [4,4],
"Atlantic/Azores": [-1,0],
"Atlantic/Bermuda": [-4,-3, 1],
"Atlantic/Canary": [0,1],
"Atlantic/Cape_Verde": [-1,-1],
"Atlantic/Faroe": [0,1],
"Atlantic/Madeira": [0,1],
"Atlantic/Reykjavik": [0,0],
"Atlantic/South_Georgia": [-2,-2],
"Atlantic/Stanley": [-3,-3],
"Australia/Adelaide": [9.5,10.5],
"Australia/Brisbane": [10,10],
"Australia/Broken_Hill": [9.5,10.5],
"Australia/Currie": [10,11],
"Australia/Darwin": [9.5,9.5],
"Australia/Eucla": [8.75,8.75],
"Australia/Hobart": [10,11],
"Australia/Lindeman": [10,10],
"Australia/Lord_Howe": [10.5,11],
"Australia/Melbourne": [10,11],
"Australia/Perth": [8,8],
"Australia/Sydney": [10,11],
"Europe/Amsterdam": [1,2],
"Europe/Andorra": [1,2],
"Europe/Astrakhan": [4,4],
"Europe/Athens": [2,3],
"Europe/Belgrade": [1,2],
"Europe/Berlin": [1,2],
"Europe/Brussels": [1,2],
"Europe/Bucharest": [2,3],
"Europe/Budapest": [1,2],
"Europe/Chisinau": [2,3],
"Europe/Copenhagen": [1,2],
"Europe/Dublin": [0,1],
"Europe/Gibraltar": [1,2],
"Europe/Helsinki": [2,3],
"Europe/Istanbul": [3,3],
"Europe/Kaliningrad": [2,2],
"Europe/Kiev": [2,3],
"Europe/Kirov": [3,3],
"Europe/Lisbon": [0,1],
"Europe/London": [0,1],
"Europe/Luxembourg": [1,2],
"Europe/Madrid": [1,2],
"Europe/Malta": [1,2],
"Europe/Minsk": [3,3],
"Europe/Monaco": [1,2],
"Europe/Moscow": [3,3],
"Europe/Nicosia": [2,3],
"Europe/Oslo": [1,2],
"Europe/Paris": [1,2],
"Europe/Prague": [1,2],
"Europe/Riga": [2,3],
"Europe/Rome": [1,2],
"Europe/Samara": [4,4],
"Europe/Saratov": [4,4],
"Europe/Simferopol": [3,3],
"Europe/Sofia": [2,3],
"Europe/Stockholm": [1,2],
"Europe/Tallinn": [2,3],
"Europe/Tirane": [1,2],
"Europe/Ulyanovsk": [4,4],
"Europe/Uzhgorod": [2,3],
"Europe/Vienna": [1,2],
"Europe/Vilnius": [2,3],
"Europe/Volgograd": [3,3],
"Europe/Warsaw": [1,2],
"Europe/Zaporozhye": [2,3],
"Europe/Zurich": [1,2],
"Factory": [0,0],
"Indian/Chagos": [6,6],
"Indian/Christmas": [7,7],
"Indian/Cocos": [6.5,6.5],
"Indian/Kerguelen": [5,5],
"Indian/Mahe": [4,4],
"Indian/Maldives": [5,5],
"Indian/Mauritius": [4,4],
"Indian/Reunion": [4,4],
"Pacific/Apia": [13,14],
"Pacific/Auckland": [12,13],
"Pacific/Bougainville": [11,11],
"Pacific/Chatham": [12.75, 13.75],
"Pacific/Chuuk": [10,10],
"Pacific/Easter": [-6,-5],
"Pacific/Efate": [11,11],
"Pacific/Enderbury": [13,13],
"Pacific/Fakaofo": [13,13],
"Pacific/Fiji": [12,13],
"Pacific/Funafuti": [12,12],
"Pacific/Galapagos": [-6,-6],
"Pacific/Gambier": [-9,-9],
"Pacific/Guadalcanal": [11,11],
"Pacific/Guam": [10,10],
"Pacific/Honolulu": [-10,-10],
"Pacific/Kiritimati": [14,14],
"Pacific/Kosrae": [11,11],
"Pacific/Kwajalein": [12,12],
"Pacific/Majuro": [12,12],
"Pacific/Marquesas": [-9.5,-9.5],
"Pacific/Nauru": [12,12],
"Pacific/Niue": [-11,-11],
"Pacific/Norfolk": [11,11],
"Pacific/Noumea": [11,11],
"Pacific/Pago_Pago": [-11,-11],
"Pacific/Palau": [9,9],
"Pacific/Pitcairn": [-8,-8],
"Pacific/Pohnpei": [11,11],
"Pacific/Port_Moresby": [10,10],
"Pacific/Rarotonga": [-10,-10],
"Pacific/Tahiti": [-10,-10],
"Pacific/Tarawa": [12,12],
"Pacific/Tongatapu": [13,14],
"Pacific/Wake": [12,12],
"Pacific/Wallis": [12,12]
NOTE on DST:
Currently only a single zone is supported for automatic adjustment for DST. This is the North America zone, which moves from standard time to daylight time on the 2nd sunday in March at 2:00am and moves from daylight to standard on the 1st sunday of November at 2:00am.
There are 15 other "zones" that have different DST days/rules which are not currently supported (in which case, standard adjustment will occur but the +/- hour will not).
For non DST timezones, format will adjust correctly as expected. The goal is eventually to support all zones, but in the meantime if somebody needs zone support sooner please ask or submit a PR.