Articles about time zones, world clocks, international scheduling, and everything related to time around the globe.
France leads with 12 time zones thanks to overseas territories. Russia follows with 11, while China uses just one for its entire territory.
Daylight Saving Time is the biggest trap. Learn practical tips to avoid confusion and never miss an international meeting again.
Japan uses UTC+9 with no Daylight Saving Time since 1951. The difference with Brazil is always 12 hours, year-round.
The difference varies between 3 and 5 hours depending on European Daylight Saving Time. Learn how to calculate it correctly.
UTC is maintained by 400+ atomic clocks in 50 countries and is the backbone of the internet, aviation, GPS, and global banking.
Brazil (2019), Russia (2014), and most of Asia have abandoned clock changes. Studies show DST increases heart attacks and sleep disorders.
Brazil has 4 time zones: Fernando de Noronha (UTC-2), Brasília (UTC-3), Amazon (UTC-4), and Acre (UTC-5). All fixed since 2019.
Tokyo, London, and New York sessions overlap in specific windows. For Brazilian investors, peak volatility hits between 10 AM and 1 PM.
India uses UTC+5:30 and Nepal UTC+5:45. Learn the political and geographic reasons behind these unusual fractional offsets.
Find the ideal overlap for calls between Brazil and Europe, USA, Portugal, and Asia — without waking anyone up at 3 AM.
Crossing the International Date Line can make you gain or lose a full day. Learn how to prevent common time zone errors while traveling.
GMT is based on astronomy; UTC is based on atomic physics. In practice the difference is under 1 second — but it matters for servers and GPS.