时间码, translated as "Time Code", is an iPhone application developed by Hangzhou Yunqi Intelligence Technology Co. Ltd. This free tool falls under the Business & Productivity category. The app focuses on the traditional Chinese method of timekeeping known as the Gan-Zhi calendar system. This ancient system combines the celestial stems and terrestrial branches to form a cycle of sixty terms, marking time in a unique and cyclical manner.

The 时间码 app serves as a pure Gan-Zhi calendar tool, reviving the significance of this traditional Chinese calendar system within the cultural revival of the Chinese nation. It provides users with a practical and educational tool to understand and utilize the Gan-Zhi chronological method in daily life and cultural practices.