UTC vs GMT
Many people believe UTC and GMT are exactly the same, but there are important differences.
GMT
Greenwich Mean Time is based on the Earth’s rotation and the position of the sun over Greenwich, England.
UTC
Coordinated Universal Time is based on atomic clocks, making it far more precise.
Key Differences
| Feature | UTC | GMT |
|---|---|---|
| Measurement | Atomic clocks | Solar time |
| Precision | Extremely precise | Slight variations |
| Usage | Global standard | Time zone reference |
Despite these differences, many countries still use GMT terminology when referring to their time zone.