America/Santo_Domingo time zone

America/Santo_Domingo is an IANA time zone used in Dominican Republic. It stays on UTC−4 all year.

America/Santo_Domingo at a glance

UTC offset now	UTC−4
Standard time	UTC−4 (AST)
Abbreviations	AST
Used in	Dominican Republic

How America/Santo_Domingo keeps time

No clock changes are scheduled in America/Santo_Domingo. The last one for daylight saving time was in 1974; since then the offset has been UTC−4 all year.

Recent and upcoming changes in America/Santo_Domingo

Date	Change	New offset
Sunday, January 20, 1974	Clocks go back 30 minutes: 12:00 AM becomes 11:30 PM	UTC−5
Sunday, October 27, 1974	Standard offset changes from UTC−5 to UTC−4	UTC−4
Sunday, October 29, 2000	Clocks go back 1 hour: 2:00 AM becomes 1:00 AM	UTC−5
Sunday, December 3, 2000	Clocks go forward 1 hour and stay there: 1:00 AM becomes 2:00 AM	UTC−4

The base offset of this zone changed in 2000, from UTC−5 to UTC−4. Old timestamps should be converted with the rule that applied at the time.

Countries and cities on America/Santo_Domingo

America/Santo_Domingo is used in Dominican Republic. These are the largest cities in our list that follow it.

America/Santo_Domingo compared with other time zones

Differences change during the year when one side moves to or from daylight saving time, so the table shows January and July separately.

City	Time now	Difference now	In January	In July
New York (United States)	--:--	1 h behind	1 h behind	Same time
Los Angeles (United States)	--:--	4 h behind	4 h behind	3 h behind
London (United Kingdom)	--:--	4 h ahead	4 h ahead	5 h ahead
Paris (France)	--:--	5 h ahead	5 h ahead	6 h ahead
Dubai (United Arab Emirates)	--:--	8 h ahead	8 h ahead	8 h ahead
Mumbai (India)	--:--	9 h 30 min ahead	9 h 30 min ahead	9 h 30 min ahead
Singapore	--:--	12 h ahead	12 h ahead	12 h ahead
Tokyo (Japan)	--:--	13 h ahead	13 h ahead	13 h ahead
Sydney (Australia)	--:--	15 h ahead	15 h ahead	14 h ahead
UTC	--:--	4 h ahead	4 h ahead	4 h ahead

Other zones on UTC−4 right now

These IANA zones show the same time as America/Santo_Domingo today. Their clock-change rules may differ.

Using America/Santo_Domingo in software

Store and send the zone as its IANA name, America/Santo_Domingo, not as a fixed offset. A fixed offset such as UTC−4 gives the wrong result after the next clock change.

Show the current time in America/Santo_Domingo:

// JavaScript
new Intl.DateTimeFormat('en-GB', { timeZone: 'America/Santo_Domingo', timeStyle: 'long' }).format(new Date());
# Python
from datetime import datetime
from zoneinfo import ZoneInfo
datetime.now(ZoneInfo('America/Santo_Domingo'))
// PHP
(new DateTime('now', new DateTimeZone('America/Santo_Domingo')))->format('c');
# Shell
TZ=America/Santo_Domingo date

Tools for time in America/Santo_Domingo

Convert a time to or from America/Santo_Domingo: pick a date and time and see it in every city on your list.
Add Santo Domingo to your world clock to keep it next to your own time.
Find a meeting time that falls inside office hours in America/Santo_Domingo and the other cities you work with.
Open a full-screen clock for your own time zone.

Frequently asked questions

What is the UTC offset of America/Santo_Domingo?

UTC−4, all year.

What abbreviation does America/Santo_Domingo use?

AST. Abbreviations are not unique, so use the zone name America/Santo_Domingo in software.

Time zone rules: IANA tz database, version 2026e. Place names and coordinates: GeoNames. Sunrise and sunset are calculated from the coordinates and can differ by a minute or two from local almanacs.