Pharmaceutical manufacturing
Puerto Rico produces a large share of the world's pharmaceuticals; supply-chain teams track AST for plant schedules.
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San Juan
Puerto Rico
Daytime
18:18:36
Wed, May 20
ASTUTC-4
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Today in San Juan
ASTUTC−4
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World Clock
Current time in San Juan
San Juan uses Atlantic Standard Time (AST, UTC−4) year-round — Puerto Rico does not observe daylight saving. The US Commonwealth's capital is a major Caribbean finance and tourism hub.
Use cases
Why people check San Juan time
Practical use cases for this city's current local time and timezone.
Tourism & Old San Juan
Millions of visitors explore Old San Juan's Spanish forts; hotel and tour times are listed in AST.
Latin music scene
Reggaeton and salsa originated partly in Puerto Rico; music industry events are scheduled in AST.
US territory finance
San Juan is the financial gateway to the Caribbean for US companies; business hours align with AST.
FAQ
San Juan time — FAQ
What time zone is San Juan in?
San Juan uses AST (UTC−4) year-round with no daylight saving time.
Is Puerto Rico always 1 hour ahead of New York?
Puerto Rico is 1 hour ahead of New York in summer (when New York is on EDT, UTC−4 vs AST UTC−4 — they're actually the same), and in winter Puerto Rico is 1 hour ahead of EST.
How far behind London is San Juan?
San Juan is 4 hours behind London in winter and 5 hours behind when London is on BST.
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