1# Time and Time Zone Subsystem 2 3## Introduction 4 5 The time and time zone subsystem provides OpenHarmony with the capability of managing the system time, time zone, and timing. 6 7- **Time and time zone management** 8 9 Manages the system time and time zone in a unified manner, including setting and obtaining the system time, date, and time zone, and obtaining the system startup time. 10 11- **Timing management** 12 13 Provides the system timer capability, including creating, starting, stopping, and destroying timers. There are three types of timers: system startup timer, system time timer, and wakeup timer. 14 15 16## System Architecture 17 18**Figure 1** Architecture of the time and time zone subsystem 19 20 21 22 23## Directory Structure 24 25The source code of the time and time zone subsystem is stored in the **/base/time** directory. 26 27The directory structure is as follows: 28 29``` 30/base/time/time_service 31├── etc # Process configuration files 32├── figures # Architecture diagram 33├── framework/js/napi # JS APIs that are parsed to NAPIs 34├── interfaces/inner_api # APIs provided for external systems 35├── services # Service implementation 36│ └── profile # System service and process configuration files 37└── utils # Utilities, for example, log utility 38``` 39 40## Repositories Involved 41 42[time_service](https://gitee.com/openharmony/time_time_service) 43
