Method
How TimeAtlas works
Simple maths, clear assumptions, nothing hidden.
--:--Your local time
Celestial dial
The dial is turning…
Every city clock is computed from your own clock plus its UTC offset — no server involved.
Where does the time come from?
Your browser's clock (Date.now) plus each city's stored UTC offset — no server and no API.
What about daylight saving?
Only standard offsets are used; daylight saving is not applied, so a few cities can be an hour out in summer.
What kind of holidays?
Fixed-date public holidays only; moveable holidays like Eid, Easter and lunar new year are excluded.
How many pages?
76 cities, 63 country holiday lists and 120 conversion pairs, in two languages.
Cities
New YorkUTC-5 · United States
Los AngelesUTC-8 · United States
ChicagoUTC-6 · United States
HonoluluUTC-10 · United States
TorontoUTC-5 · Canada
VancouverUTC-8 · Canada
Mexico CityUTC-6 · Mexico
São PauloUTC-3 · Brazil
Rio de JaneiroUTC-3 · Brazil
Buenos AiresUTC-3 · Argentina
SantiagoUTC-3 · Chile
BogotáUTC-5 · Colombia
LimaUTC-5 · Peru
LondonUTC+0 · United Kingdom
DublinUTC+0 · Ireland
LisbonUTC+0 · Portugal
ParisUTC+1 · France
BerlinUTC+1 · Germany
MadridUTC+1 · Spain
RomeUTC+1 · Italy
AmsterdamUTC+1 · Netherlands
BrusselsUTC+1 · Belgium
ZurichUTC+1 · Switzerland
ViennaUTC+1 · Austria
StockholmUTC+1 · Sweden
OsloUTC+1 · Norway
CopenhagenUTC+1 · Denmark
WarsawUTC+1 · Poland
PragueUTC+1 · Czechia
AthensUTC+2 · Greece
KyivUTC+2 · Ukraine
BucharestUTC+2 · Romania
IstanbulUTC+3 · Turkey
MoscowUTC+3 · Russia
CairoUTC+2 · Egypt
LagosUTC+1 · Nigeria
NairobiUTC+3 · Kenya
JohannesburgUTC+2 · South Africa
AccraUTC+0 · Ghana
CasablancaUTC+1 · Morocco
Addis AbabaUTC+3 · Ethiopia
DubaiUTC+4 · United Arab Emirates
RiyadhUTC+3 · Saudi Arabia
DohaUTC+3 · Qatar
Kuwait CityUTC+3 · Kuwait
TehranUTC+3.5 · Iran
KarachiUTC+5 · Pakistan
LahoreUTC+5 · Pakistan
MumbaiUTC+5.5 · India
DelhiUTC+5.5 · India
BengaluruUTC+5.5 · India
DhakaUTC+6 · Bangladesh
ChattogramUTC+6 · Bangladesh
ColomboUTC+5.5 · Sri Lanka
KathmanduUTC+5.75 · Nepal
BangkokUTC+7 · Thailand
HanoiUTC+7 · Vietnam
Ho Chi Minh CityUTC+7 · Vietnam
Phnom PenhUTC+7 · Cambodia
JakartaUTC+7 · Indonesia
SingaporeUTC+8 · Singapore
Kuala LumpurUTC+8 · Malaysia
ManilaUTC+8 · Philippines
ShanghaiUTC+8 · China
BeijingUTC+8 · China
Hong KongUTC+8 · Hong Kong
TaipeiUTC+8 · Taiwan
PerthUTC+8 · Australia
TokyoUTC+9 · Japan
SeoulUTC+9 · South Korea
SydneyUTC+11 · Australia
MelbourneUTC+11 · Australia
SuvaUTC+12 · Fiji
AucklandUTC+13 · New Zealand
TashkentUTC+5 · Uzbekistan
AlmatyUTC+5 · Kazakhstan