Cardiff to San Juan, Puerto Rico
San Juan is 5 hours behind of Cardiff.
Cardiff
Wales, UK
Difference
San Juan
Puerto Rico
Best window to call: 14:00 - 17:00 Cardiff time, both sides are inside 09:00-17:00.
Hour-by-hour conversion
Every hour of the day in Cardiff with its equivalent in San Juan. Green rows fall inside business hours for both.
About the Cardiff-San Juan gap
Cardiff sits in the Europe/London time zone (BST), while San Juan uses America/Puerto_Rico (AST). That puts San Juan 5 hours behind of Cardiff right now.
These two cities do not handle daylight saving the same way, one adjusts its clocks seasonally and the other does not. The difference between them therefore moves by an hour twice a year, which is a common cause of missed meetings. The clocks above always show the live position rather than an assumed offset.
For scheduling, the practical overlap runs from 14:00 to 17:00 in Cardiff. Booking inside that band means neither party is dialling in before breakfast or after dinner.
Related comparisons
- San Juan to Cardiff
- Cardiff to London
- Cardiff to New York
- Cardiff to Los Angeles
- Cardiff to Chicago
- Cardiff to São Paulo
- Cardiff to Paris
See also current time in Cardiff and current time in San Juan.
Cardiff and San Juan, questions
- What is the time difference between Cardiff and San Juan?
- San Juan is 5 hours behind of Cardiff. Cardiff is currently on BST and San Juan on AST.
- What is the best time to call San Juan from Cardiff?
- Between 14:00 and 17:00 Cardiff time, both cities are inside normal business hours of 09:00 to 17:00. Outside that window one side is either not yet at work or has already left.
- Is the difference between Cardiff and San Juan always the same?
- No. One of these cities observes daylight saving time and the other does not, so the gap changes by an hour at each transition. Always check the live clocks rather than relying on a remembered offset.