Best Times to Call International Clients: A Country-by-Country Guide

Calling a client in Tokyo from New York? That 2 PM call you are about to make is actually 3 AM in Japan. Getting international calling times right is part science (time zone math) and part art (cultural etiquette). This guide covers the optimal calling windows for 20+ countries, factoring in local business hours, lunch breaks, prayer times, and cultural norms.

United States & Canada

Optimal calling window: 9:00 AM | 4:00 PM local time. North American business culture is early-starting. Many executives are at their desks by 7:30 AM, especially on the East Coast. The best time for important calls is 9:30 AM to 11:30 AM | after the morning email triage but before lunch. Avoid calling between 12:00 PM and 1:30 PM (lunch) and after 4:30 PM on Fridays (people mentally check out). Monday mornings are generally bad for cold calls but fine for scheduled meetings.

United Kingdom

Optimal calling window: 9:30 AM | 12:00 PM and 2:00 PM | 4:30 PM GMT. British business culture is punctual and professional. Mornings are for important work, so schedule your most critical calls for 10:00 AM. Lunch is typically 12:30-1:30 PM. Friday afternoons are notoriously unproductive | many offices empty out by 4:00 PM, especially in summer. Avoid August entirely for new business | much of the UK takes holiday.

Germany

Optimal calling window: 9:00 AM | 12:00 PM and 2:00 PM | 4:00 PM CET. Germans are early risers and highly structured. The best time is 10:00 AM. Lunch (Mittagspause) is sacred | typically 12:00-1:00 PM sharp. Do not call during lunch. Friday afternoons: many offices close by 3:00 PM. Germans value directness and preparation. Send an agenda in advance and be on time, literally to the minute. Punctuality is non-negotiable in German business culture.

Japan

Optimal calling window: 10:00 AM | 12:00 PM and 1:00 PM | 5:00 PM JST. Japanese business culture is formal and hierarchical. The best time to call is 10:30 AM, after the morning meeting and before lunch (12:00-1:00 PM). Be aware that many Japanese professionals work late | it is not uncommon to receive calls until 7:00 PM. However, never call before 9:00 AM. Always address people by their last name + san. If calling from overseas, confirm the time zone explicitly: Japan is UTC+9 year-round with no DST.

India

Optimal calling window: 10:00 AM | 1:00 PM and 2:30 PM | 6:00 PM IST. India Standard Time is UTC+5:30, one of the few half-hour offset time zones. The best time to reach Indian professionals is 11:00 AM IST. Lunch is typically 1:00-2:30 PM. Indian business culture is relationship-oriented | a few minutes of personal conversation before getting to business is appreciated. India does not observe DST, so the time difference with the US and Europe shifts seasonally.

United Arab Emirates

Optimal calling window: 9:00 AM | 1:00 PM and 2:00 PM | 5:00 PM GST. The UAE work week is Monday-Friday. Friday is a half day for many businesses due to Jumu'ah (Friday prayers). The best time to call is 10:00 AM Sunday-Thursday. Avoid calling during Friday prayers (roughly 11:30 AM-1:00 PM). Ramadan (dates vary yearly) dramatically changes business hours | most offices work 9:00 AM-2:00 PM. In 2026, Ramadan is expected to begin around February 17.

Brazil

Optimal calling window: 9:00 AM | 12:00 PM and 2:00 PM | 5:00 PM BRT. Brazilian business culture is warm and relationship-focused. Expect a few minutes of personal chat before getting to business. The best time is 10:00 AM. Lunch is typically 12:00-2:00 PM and can be leisurely. Brazil spans multiple time zones: Brasilia time (UTC-3) covers the business centers of Sao Paulo and Rio. Be mindful of Carnaval season (February/March) when business slows to a crawl.

China

Optimal calling window: 9:30 AM | 12:00 PM and 1:30 PM | 5:00 PM CST. All of China uses a single time zone (UTC+8), so business hours are uniform regardless of geography. The best time to call is 10:00 AM. Lunch is typically 12:00-1:30 PM. Chinese New Year (late January or February) is the most important holiday | expect business to shut down for 1-2 weeks. In 2026, Chinese New Year falls on February 17. Never call during this period.

Australia

Optimal calling window: 9:00 AM | 12:00 PM and 1:00 PM | 4:30 PM AEST/AEDT. Australian business culture is relatively informal but professional. The best time to call is 10:00 AM. Lunch is 12:00-1:00 PM. Australians tend to start and finish early compared to other countries | 8:30 AM to 4:30 PM is common. December-January is summer holiday season | many people take extended leave. Australia has multiple time zones and observes DST in some states, so always verify the local time.

Quick Reference: When to Call From New York (EST)

Always use our Meeting Planner to confirm exact times and our Business Hours tool to check if the target country is currently working.