New York and San Juan are usually on the same time or 1 hour apart. San Juan uses Atlantic Standard Time (AST, UTC-4) year-round, while New York uses Eastern Time (EST/EDT, UTC-5/-4). During standard time, San Juan is 1 hour ahead; during daylight saving time, both cities are the same.
Puerto Rico does not observe daylight saving time, so the difference varies seasonally.
Any time generally works! Since both cities are usually on the same time or just 1 hour apart, you can call during normal business hours with minimal adjustment.
New York and San Juan have strong connections, with millions of Puerto Ricans living in New York City. Puerto Rico is a US territory, making travel easy with no passport required. Direct flights take about 3.5 hours.