🌍 Guide to Coordinated Universal Time (UTC) & Time Zones
Whether for global business, international travel, or communicating with friends on the other side of the planet, knowing the exact time in different cities is essential. Humans divided the world into time zones due to longitudinal differences caused by Earth's rotation, establishing standard times to coordinate activities.
🕒 Difference Between UTC and GMT
UTC and GMT are often used interchangeably, but they differ. GMT (Greenwich Mean Time) is the mean solar time based on the Royal Observatory in Greenwich, London, and historically served as the global standard. Conversely, UTC (Coordinated Universal Time) is a modern, precise atomic time standard introduced in 1972, adjusted with leap seconds to correct solar variance. Modern computers and network equipment rely on UTC for millisecond-level precision.
For example, Korea Standard Time (KST) follows the meridian at 135 degrees east and is 9 hours ahead of UTC (denoted as UTC+9). On the other hand, New York follows Eastern Standard Time (EST), which is UTC-5, resulting in a 14-hour time difference between Korea and New York.
💡 World Time Guide & Daylight Saving Time (DST)
- Q. Why is a specific country's time off by exactly one hour?
A. Many countries, including the United States and European nations, implement Daylight Saving Time (DST) to shift an hour of daylight to the evening during summer. During DST (typically March to November), the time difference with those cities decreases by one hour. Please pay close attention when scheduling global conference calls or booking flights. - Q. Is the real-time update accurate?
A. The world clock on EVEDAYS synchronizes with your device's local clock to perform optimized local rendering. Since it calculates timezone differences locally every second without querying an external server, you can use it with total confidence.