Warsaw is 6 hours ahead of New York. New York uses Eastern Time (EST/EDT, UTC-5/-4) while Warsaw uses Central European Time (CET/CEST, UTC+1/+2). When it's 12:00 PM in New York, it's 6:00 PM in Warsaw.
Both cities observe daylight saving time on similar schedules, so the 6-hour difference remains relatively constant year-round.
Best calling time: 3:00 AM - 12:00 PM New York time. This corresponds to 9:00 AM - 6:00 PM in Warsaw. Morning calls from New York work best.
New York has a significant Polish-American community. Poland has become an important European tech hub, and Warsaw is a growing financial center. LOT Polish Airlines operates direct flights between the cities.