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With about 17.5 million inhabitants, Shenzhen ranks among China's most populous cities, sitting on the southern coast near 22 degrees north latitude, close to the Tropic of Cancer. It observes China Standard Time, the unified UTC+8 offset used nationwide, and makes no daylight-saving change, leaving its clocks eight hours ahead of Coordinated Universal Time in all seasons. Because mainland China applies a single time zone, Shenzhen reads the same hour as cities thousands of kilometres to the north and west. Its steady offset and absence of seasonal shifts make time conversions to other regions predictable throughout the year, a useful trait for a city closely tied to international commerce.